A TRADITION of EXCELLENCE A VISION for TOMORROW

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1 Pre-Algebra Grade 8 The Number System To successfully complete Grade 8 Pre-Algebra, the learner will Cluster: Know that there are numbers that are not rational, and approximate them by rational numbers. Essential Question: In what ways can rational numbers be useful? AL COS 1-8.NS.1 Know that numbers that are not rational are called irrational. Understand informally that every number has a decimal expansion; for rational numbers show that the decimal expansion repeats eventually, and convert a decimal expansion which repeats eventually into a rational number. Rational numbers can be represented in multiple ways and are useful when examining situations involving numbers that are not whole. Classify a number as rational or irrational based on its decimal expansion. Convert a repeating decimal into a rational number. Meaning of symbols, words, etc. RST Make a model. RST Reason abstractly and quantitatively. Rational Number, Irrational Number

2 Pre-Algebra Grade 8 The Number System To successfully complete Pre-Algebra Grade, the learner will Cluster: Know that there are numbers that are not rational, and approximate them by rational numbers. Essential Question: In what ways can rational numbers be useful? AL COS 2-8.NS.2 Use rational approximations of irrational numbers to compare the size of irrational numbers, locate them approximately on a number line diagram, and estimate the value of expressions (e.g. π 2 ), For example, by truncating the decimal expansion of 2, show that 2 is between 1 and 2, then between 1.4 and 1.5, and explain how to continue on to get better approximations. Rational numbers can be represented in multiple ways and are useful when examining situations involving numbers that are not whole. Use reasoning to determine between which two consecutive whole numbers a square root will fall (e.g., I can reason that 39 is 6 and 7, because it is between 36 and 49.). Plot the estimated value of an irrational number on a number line. Estimate the value of an irrational number by rounding to a specific place value. Use estimated values to compare two or more irrational numbers. Structure chosen. RST Attend to precision. Rational Number, Irrational Number

3 Pre-Algebra Grade 8 Expressions Equations Cluster: Work with radicals and integer exponents. Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 3-8.EE.1 Know and apply the properties of integer exponents to generate equivalent numerical expressions. For example, = 3 = = Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that. the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Determine the properties of integer exponents by exploring patterns and applying my understanding of properties of whole number exponents. Use the properties of integer exponents to simplify expressions. Meaning of symbols, words, etc. RST Look for and make use of structure. Integer, Exponent

4 Cluster: Work with radicals and integer exponents. Pre-Algebra Grade 8 Expressions and Equations Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 4-8.EE.2 Use square root and cube root symbols to represent solutions to equations of the form x2 = p and x3 = p, where p is a positive rational number. Evaluate square roots of small perfect squares and cube roots of small perfect cubes. Know that 2 is irrational. Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Recognize taking a square root as the inverse of squaring a number. Recognize taking a cube root as the inverse of cubing a number. Evaluate the square root of a perfect square. Evaluate the cube root of a perfect cube. Justify that the square root of a non-perfect square will be irrational. Meaning of symbols, words, etc. RST Support arguments. WHST Reason abstractly and quantitatively. Cube, Square, Cube Root, Square Root, Radical, Perfect Square, Perfect Cube, Irrational

5 Cluster: Work with radicals and integer exponents. Pre-Algebra Grade 8 Expressions and Equations Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 5-8.EE.3 Use numbers expressed in the form of a single digit times an integer power of 10 to estimate very large or very small quantities, and to express how many times as much one is than the other. Example: Estimate the population of the United States as and the population of the world as 7 109, and determine that the world population is more than 20 times larger. Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Write an estimation of a large quantity by expressing it as the product of a single-digit number and a positive power of ten. Write an estimation of a very small quantity by expressing it as the product of a single-digit number and a negative power of ten. Compare quantities written as the product of a single-digit number and a power of ten by stating their multiplicative relationships. Meaning of symbols, words, etc. RST Look for and make use of structure. Power of Ten

6 Pre-Algebra Grade 8 Expressions and Equations Cluster: Work with radicals and integer exponents. Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 6-8.EE.4 Perform operations with numbers expressed in scientific notation, including problems where both decimal and scientific notation are used. Use scientific notation and choose units of appropriate size for measurements of very large or very small quantities (e.g., use millimeters per year for seafloor spreading). Interpret scientific notation that has been generated by technology. Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Add and subtract two numbers written in scientific notation. Multiply and divide two numbers written in scientific notation. Select the appropriate units for measuring derived measurements when comparing quantities written in scientific notation. Identify and interpret the various ways scientific notation is displayed on calculators and through computer software. Structure chosen. RST Use technology to publish writing. WHST Attend to precision. Scientific Notation, Power of Ten

7 Pre-Algebra Grade 8 Expressions and Equations Cluster: Understand the connections between proportional relationships, lines, and linear equations. Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 7-8.EE.5 Graph proportional relationships, interpreting the unit r ate as the slope of the graph. Compare two different proportional relationships represented in different ways. Example: Compare a distance-time graph to a distance-time equation to determine which of two moving objects has greater speed. Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Graph a proportional relationship in the coordinate plane. Interpret the unit rate of a proportional relationship as the slope of the graph. Justify that the graph of a proportional relationship will always intersect the origin (0, 0) of the graph. Use a graph, a table, or an equation to determine the unit rate of a proportional relationship and use the unit rate to make comparisons between various porportional relationships. Make a model. RST Look for and express regularity in repeated reasoning. Proportional Relationship, Unit Rate, Slope

8 Pre-Algebra Grade 8 Expressions and Equations Cluster: Understand the connections between proportional relationships, lines, and linear equations. Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 8-8.EE.6 Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b. Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Create right triangles by drawing a horizontal line segments and a vertical line segments from any two points on a nonvertical line in the coordinate plane. Justify that these right triangles are similar by comparing the ratios of the lengths of the corresponding legs. Justify that since the triangles are similar, the ratios of all corresponding hypotenuses, representing the slope of the line, will be equivalent. Justify that an equation in the form y=mx will represent the graph of a proportional relationship with a slope of m and a y- intercept of 0. Justify that an equation in the form y=mx+b represents the graph of a linear relationship with a slope of m and a y- intercept of b. Follow a procedure. RST Right Triangle, Leg, Hypotenuse, Similar Triangles, Ratio, Slope, Proportional Relationship, Y-Intercept Support arguments. WHST Make sense of problems and persevere in solving them.

9 Pre-Algebra Grade 8 Expressions and Equations Cluster: Analyze and solve linear equations and pairs of simultaneous linear equations. Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 9-8.EE.7 Solve linear equations in one variable. a. AL COS 9a -8.EE.7a Give examples of linear equations in one variable with one solution, infinitely many solutions, or no solutions. Show which of these possibilities is the case by successively transforming the given equation into simpler forms until an equivalent equation of the form x = a, a = a, or a = b results (where a and b are different numbers). b. AL COS 9b - 8.EE.7b Solve linear equations with rational number coefficients, including equations whose solutions require expanding expressions, using the distributive property and collecting like terms. Algebraic expressions and equations are used to model reallife problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Use the properties of real numbers to determine the solution of a linear equation. Simplify a linear equation by using the distributive property and/or combining like terms. Give examples of linear equations with one solution, infinitely many solutions, or no solution. Follow a procedure. RST Look for and make use of structure. Linear Equation, Equivalent Equations, Rational Number, Coefficient, Like Terms, Solution

10 Pre-Algebra Grade 8 Expressions and Equations Cluster: Analyze and solve linear equations and pairs of simultaneous linear equations. Essential Question: How can algebraic expressions and equations be used to model, analyze, and solve mathematical situations? AL COS 10-8.EE.8 Analyze and solve pairs of simultaneous linear equations. a. AL COS 10a - 8.EE.8a Understand that solutions to a system of two linear equations in two variables correspond to points of intersections of their graphs because points of intersection satisfy both equations simultaneously. b. AL COS 10b - 8.EE.8b Solve systems of two linear equations in two variables algebraically, and estimate solutions by graphing the equations. Solve simple cases by inspection. c. AL COS 10c - 8.EE.8c Solve real-world and mathematical problems leading to two linear equations in two variables. Algebraic expressions and equations are used to model real-life problems and represent quantitative relationships, so that the numbers and symbols can be mindfully manipulated to reach a solution or make sense of the quantitative relationships. Can explain how a line represents the infinite number of solutions to a linear equation with two variables. Can explain how the point(s) of intersection of two graphs will represent the solution to the system of two linear equations because that/those point(s) are solutions to both equations. Use algebraic reasoning (simple substitution) and the properties of real numbers to solve a system of linear equations. Use the graphs of two linear equations to estimate the solution of the system Use mathematical reasoning to solve simple systems of linear equations. Solve real-world problems and mathematical problems dealing with systems of linear equations and interpret the solution in the context of the problem. Make a model. RST Linear Equation, System of Linear Equation (also, Simultaneous Linear Equations), Intersection 2. Reason abstractly and quantitatively.

11 Pre-Algebra Grade 8 Functions Cluster: Define, evaluate, and compare functions. Essential Question: How are functions useful? AL COS 11-8.F.1 Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output. (Function notation is not required in Grade 8.) The characteristics of functions and their representations are useful in making sense of patterns and solving problems involving quantitative relationships. Explain that a function represents a relationship between an input and an output where the output depends on the input; therefore, there can be only one output for each input. Show the relationship between the inputs and outputs of a function by graphing them as ordered pairs on a coordinate grid. Meaning of symbols, words, etc. RST Support arguments. WHST Construct viable arguments and critique the reasoning of others. Function, Input, Output

12 Pre-Algebra Grade 8 - Functions Cluster: Define, evaluate, and compare functions. Essential Question: How are functions useful? AL COS 12-8.F.2 Compare properties of two functions, each represented in a different way (algebraically, graphically, numerically in tables, or by verbal descriptions). Example: Given a linear function represented by a table of values and linear function represented by an algebraic expression, determine which function has the greater rate of change. The characteristics of functions and their representations are useful in making sense of patterns and solving problems involving quantitative relationships. Determine the properties of a function written in algebraic form (e.g. rate of change, meaning of y-intercept, linear, nonlinear). Determine the properties of a function when given the inputs and outputs in a table. Determine the properties of a function represented as a graph. Determine the properties of a function when given the situtation verbally. Compare the properties of two functions that are represented differently (e.g., as an equation, in a table, graphically or a verbal representation). Function, Linear Function, Rate of Change Make a model. RST Support arguments. WHST Look for and make use of structure.

13 Pre-Algebra Grade 8 - Functions Cluster: Define, evaluate, and compare functions. Essential Question: How are functions useful? AL COS 13-8.F.3 Interpret the equation y = mx + b as defining a linear function whose graph is a straight line; give examples of functions that are not linear. Example: The function A = s2 giving the area of a square as a function of its side length is not linear because its graph contains the points (1,1), (2,4), and (3,9), which are not on a straight line. The characteristics of functions and their representations are useful in making sense of patterns and solving problems involving quantitative relationships. Explain why the equation y=mx+b represents a linear function and interpret the slope and y-intercept in relation to the function. Give examples of relationships that are non-linear functions. Analyze the rate of change between input and output values to determine if function is linear or non-linear. Create a table of values that can be defined as a non-linear function. Make a model. RST Support arguments. WHST Construct viable arguments and critique the reasoning of others. Linear Function

14 Pre-Algebra Grade 8 - Functions Cluster: Use functions to model relationships between quantities. Essential Question: How are functions useful? AL COS 14-8.F.4 Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the function from a description of a relationship or from two (x,y) values, including reading these from a table or from a graph. Interpret the rate of change and initial value of linear function in terms of the situation it models and in terms of its graph or a table of values. The characteristics of functions and their representations are useful in making sense of patterns and solving problems involving quantitative relationships. Write a linear function that models a given situation given verbally as a table of x- and y- values or as a graph. Define the initial value of the function in relation to the situation. Define the rate of change in relation to the situation. Define the y-intercept in relation to the situation. Explain any constraints on the domain in relation to the situation. Make a model. RST Make sense of problems and persevere in solving them. Linear Function, Rate of Change

15 Pre-Algebra Grade 8 - Functions Cluster: Use functions to model relationships between quantities. Essential Question: How are functions useful? AL COS 15-8.F.5 Describe qualitatively the functional relationship between two quantities by analyzing a graph (e.g., where the function is increasing or decreasing, linear or nonlinear). Sketch a graph that exhibits the qualitative features of a function that has been described verbally. The characteristics of functions and their representations are useful in making sense of patterns and solving problems involving quantitative relationships. Match the graph of function to a given situation. Write a story that describes the functional relationship between two variables depicted on a graph. Create a graph of function that describes the relationship between two variables. Compare/contrast. RST Model with mathematics. Increasing, Decreasing, Linear, Nonlinear

16 Pre-Algebra Grade 8 - Geometry Cluster: Understand congruence and similarity using physical models, transparencies, or geometry software. Essential Question: How does geometry better describe objects? AL COS 16-8.G.1 Verify experimentally the properties of rotations, reflections, and translations: a. AL COS 16a - 8.G.1a Lines are taken to lines, and line segments are taken to line segments of the same length. b. AL COS 16b - 8.G.1b Angles are taken to angles of the same measure. c. AL COS 16c - 8.G.1c Parallel lines are taken to parallel lines. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Verify by measuring and comparing lengths, angle measures, and parallelism of a figure and its image that after a figure has been translated, corresponding lines and line segments remain the same length, corresponding angles have the same measure, and corresponding parallel lines remain parallel. Verify by measuring and comparing lengths, angle measures, and parallelism of a figure and its image that after a figure has been reflected, corresponding lines and line segments remain the same length, corresponding angles have the same measure, and corresponding parallel lines remain parallel. Verify by measuring and comparing lengths, angle measures, and parallelism of a figure and its image that after a figure has been rotated, corresponding lines and line segments remain the same length, corresponding angles have the same measure, and corresponding parallel lines remain parallel. Transformation, Translation, Reflection, Rotation, Parallel Line Follow a procedure. RST Support arguments. WHST Construct viable arguments and critique the reasoning of others.

17 Pre-Algebra Grade 8 - Geometry Cluster: Understand congruence and similarity using physical models, transparencies, or geometry software. Essential Question: How does geometry better describe objects? AL COS 17-8.G.2 Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Explain how transformations can be used to prove that two figures are congruent. Perform a series of transformations (reflections, rotations, and/or translations) to prove or disprove that two given figures are congruent. Follow a procedure. RST Model with mathematics. Congruent, Transformation, Reflection, Rotation, Translation

18 Pre-Algebra Grade 8 - Geometry Cluster: Understand congruence and similarity using physical models, transparencies, or geometry software. Essential Question: How does geometry better describe objects? AL COS 18-8.G.3 Describe the effect of dilations, translations, rotations, and reflections on two-dimensional figures using coordinates. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Describe the changes occurring to the x- and y- coordinates of a figure after a translation. Describe the changes occurring to the x- and y- coordinates of a figure after a reflection. Describe the changes occurring to the x- and y- coordinates of a figure after a rotation. Describe the changes occurring to the x- and y- coordinates of a figure after a dilation. Make a model. RST Reason abstractly and quantitatively. Transformation, Translation, Reflection, Rotation, Dilation

19 Lee County Schools Math Pacing Guide Pre-Algebra Grade 8 - Geometry Cluster: Understand congruence and similarity using physical models, transparencies, or geometry software. Essential Question: How does geometry better describe objects? AL COS 19-8.G.4 Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Explain how transformations can be used to prove that two figures are similar. Describe a sequence of transformations to prove or disprove that two given figures are similar. Cite evidence. RST Model with mathematics. Similar, Transformation, Reflection, Rotation, Translation, Dilation

20 Pre-Algebra Grade 8 - Geometry Cluster: Understand congruence and similarity using physical models, transparencies, or geometry software. Essential Question: How does geometry better describe objects? AL COS 20-8.G.5 Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. Example: Arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give argument in terms of transversals why this is so. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Informally prove that the sum of any triangle s interior angles will have the same measure as a straight angle (i.e., by tearing off the three corners of a triangle and arranging them to form a 180 straight angle). Informally prove that the sum of any polygon s exterior angles will be 360-degrees. Make conjectures regarding the relationships and measurements of the angles created when two parallel lines are cut by a transversal. Apply proven relationships to establish minimal properties to justify similarity. Interior Angle, Exterior Angle, Parallel Lines, Transversal, Similar Purpose for an explanation. RST Support arguments. WHST Model with mathematics.

21 Pre-Algebra Grade 8 - Geometry Cluster: Understand and apply the Pythagorean Theorem Essential Question: How does geometry better describe objects? AL COS 21-8.G6 Explain a proof of the Pythagorean Theorem and its converse. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Use of visual models to demonstrate the relationship of the three side lengths of any right triangle. Use algebraic reasoning to relate the visual model to the Pythagorean Theorem. Use the Pythagorean Theorem to determine if a given triangle is a right triangle. Purpose for an explanation. RST Model with mathematics. 7. Look for and make use of structure. Pythagorean Theorem, Leg, Hypotenuse, Converse

22 Pre-Algebra Grade 8 - Geometry Cluster: Understand and apply the Pythagorean Theorem. Essential Question: How does geometry better describe objects? AL COS 22-8.G.7 Apply the Pythagorean Theorem to determine unknown side lengths in right triangles in real-world and mathematical problems in two and three dimensions. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Apply the Pythagorean Theorem to find an unknown side length of a right triangle. Draw a diagram and use the Pythagorean Theorem to solve real-world problems involving right triangles. Draw a diagram to find right triangles in a three-dimensional figure and use the Pythagorean Theorem to calculate various dimensions. Follow a procedure. RST Support arguments. WHST Model with mathematics. Pythagorean Theorem, Leg, Hypotenuse

23 Cluster: Understand and apply the Pythagorean Theorem Pre-Algebra Grade 8 - Geometry Essential Question: How does geometry better describe objects? AL COS 23-8.G.8 Apply the Pythagorean Theorem to find the distance between two points in a coordinate system. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Connect any two points on a coordinate grid to a third point so that the three points form a right triangle. Use the right triangle and the Pythagorean Theorem to find the distance between the original two points. Follow a procedure. RST Support arguments. WHST Reason abstractly and quantitatively. Pythagorean Theorem, Leg, Hypotenuse

24 Pre-Algebra Grade 8 - Geometry Cluster: Solve real-world and mathematical problems involving volume of cylinders, cones, and spheres. Essential Question: How does geometry better describe objects? AL COS 24-8.G.9 Know the formulas for the volumes of cones, cylinders, and spheres and use them to solve real-world and mathematical problems. Geometric attributes (such as shapes, lines, angles, figures, and planes) provide descriptive information about an object s properties and position in space and support visualization and problem solving. Describe the similarity between finding the volume of a cylinder and the volume of a right prism. Recall the formula to find the volume of a cylinder. Informally prove the relationship between the volume of a cylinder and the volume of a cone with the same base. Recall the formula to find the volume of a cone. Informally prove the relationship between the volume of a sphere and the volume of a circumscribed cylinder. Recall the formula to find the volume of a sphere. Use the formula to find the volume of cylinders, cones, and spheres. Solve real-world problems involving the volume of cylinders, cones, and spheres. Follow a procedure. RST Make a model. RST Support arguments. WHST Model with mathematics. Cylinder, Cone, Sphere, Volume

25 Pre-Algebra Grade 8 - Statistics and Probability Cluster: Investigate patterns of association in bivariate data. Essential Question: How is probability used to make informed decisions about uncertain events? AL COS 25-8.SP.1 Construct and interpret scatter plots for bivariate measurement data to investigate patterns of association between two quantities. Describe patterns such as clustering, outliers, positive or negative association, linear association, and nonlinear association. The rules of probability can lead to more valid and reliable predictions about the likelihood of an event occurring. Plot ordered pairs on a coordinate grid representing the relationship between two data sets. Describe patterns in the plotted points such as clustering, outliers, positive or negative association, and linear or nonlinear association and describe the pattern in the context of the measurement data. Interpret the patterns of association in the context of the data sample. Compare/contrast. RST Model with mathematics. Scatter Plot, Bivariate, Clustering, Outliers, Positive Association, Negative Association, Linear Association, Nonlinear Association

26 Pre-Algebra Grade 8 Statistics and Probability Cluster: Investigate patterns of association in bivariate data. Essential Question: How is probability used to make informed decisions about uncertain events? AL COS 26-8.SP.2 Know that straight lines are widely used to model relationships between two quantitative variables. For scatter plots that suggest a linear association, informally fit a straight line, and informally assess the model fit by judging the closeness of the data points to the line. The rules of probability can lead to more valid and reliable predictions about the likelihood of an event occurring. Recognize whether or not data plotted on a scatter plot have a linear association. Draw a straight trend line to approximate the linear relationship between the plotted points of two data sets. Make inferences regarding the reliability of the trend line by noting the closeness of the data points to the line. Make a model. RST Compare/contrast. RST Construct viable arguments and critique the reasoning of others. Scatter Plot, Linear Association, Trend Line, Line of Best Fit

27 Pre-Algebra Grade 8 Statistics and Probability Cluster: Investigate patterns of association in bivariate data. Essential Question: How is probability used to make informed decisions about uncertain events? AL COS 27-8.SP.3 Use the equation of a linear model to solve problems in the context of bivariate measurement data, interpreting the slope and intercept. Example: In a linear model for a biology experiment, interpret a slope of 1.5 cm/hr as meaning that an additional hour of sunlight each day is associated with an additional 1.5 cm in mature plant height. The rules of probability can lead to more valid and reliable predictions about the likelihood of an event occurring. Determine the equation of the trend line that approximates the linear relationship between the plotted points of two data sets. Interpret the y-intercept of the equation in the context of collected data. Interpret the slope of the equation in the context of the collected data. Use the equation of the trend line to summarize the given data and make predictions regarding additional data points. Make a model. RST Compare/contrast. RST Support arguments. WHST Reason abstractly and quantitatively. Linear Model, Bivariate, Slope, Y-Intercept, Trend Line, Line of Best Fit

28 Pre-Algebra Grade 8 Statistics and Probability Cluster: Investigate patterns of association in bivariate data. Essential Question: How is probability used to make informed decisions about uncertain events? AL COS 28-8.SP.4 Understand the patterns of association can also be seen in bivariate categorical data by displaying frequencies and relative frequencies in a two-way table. Construct and interpret a two-way table summarizing data on two categorical variables collected from the same subjects. Use relative frequencies calculated for rows or columns to describe possible association between the two variables. The rules of probability can lead to more valid and reliable predictions about the likelihood of an event occurring. Create a two-way table to record the frequencies of bivariate categorical values. Determine the relative frequencies for rows and/or columns of a two-way table. Use the relative frequencies and context of the problem to describe possible associations between the two sets of data. Make a model. RST Compare/contrast. RST Construct viable arguments and critique the reasoning of others. Bivariate, Categorical Data, Two-Way Table, Frequency, Relative Frequency

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