MATH-A Day 8 - Stats Exam not valid for Paper Pencil Test Sessions

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1 MATH-A Day 8 - Stats Exam not valid for Paper Pencil Test Sessions [Exam ID:1LCDDJ 1 Karen knows that the z-score for a specific element within a set of data is.97. Karen can conclude that the element falls approximately A one standard deviation below the mean of the data set B half of a standard deviation above the mean of the data set C half of a standard deviation below the mean of the data set D one standard deviation above the mean of the data set 2 John recorded the times that it took 12 remote controlled cars to complete an obstacle course and would like to determine the spread of the elements in the data set by calculating the variance. What is the approximate variance of the data set? A 33.9 B 3.7 C D Select the correct answer. Looking at the two sets of test scores, which is a true conclusion? Math Test: 85, 92, 88, 80, 91 and 20 Science Test: 85, 92, 88, 80, 91 and 74 A The mean absolute deviation is greater than the standard deviation for the math test scores. B The standard deviation for the science test scores is greater than for the math test scores. C The standard deviation for the math test scores is greater than for the science test scores. D The mean absolute deviation is greater than the standard deviation for the science test scores.

2 4 Type the answer in the box. How many data points are within one standard deviation of the mean? 5 Directions: Click and drag an option to the correct box. The students in four different classes recorded their pulse rates. Each class has an equal number of students. Complete the table with descriptions for two of the classes. Class Period 1 pulse rate data: mean = 78.6 mean of absolute deviation = 2.8 Class Period 3 pulse rate data: mean = 74.3 mean of absolute deviation = 5.2

3 6 Directions: Type your answer in the box. The scores for the first test in Mr. Jones' Algebra I formed an approximately normal distribtuion. The class mean for their first test was The standard deviation was 5.4. Joe earned an 84 on the test. What is Joe's z-score? Round your answer to the nearest tenth. 7 Two different classes took the same test. Data from the test for four students is shown in the table. Using z-scores, which student's test score is closest to the mean? A Harlow B Justy C Presley D Zenya 8 Click on a box to choose the class size you want to select. You must select all correct class sizes. Class enrollment for ten Algebra I classes at Fairview High School are listed below. Which classes have enrollments that are within one standard deviation of the mean? {12, 16, 17, 19, 21, 22, 23, 26, 27, 29} Type your answer in the box. A data set is normally distributed with a mean of 28 and a standard deviation of 3. Which data point corresponds to a z-score of 3?

4 10 Directions: Click on a box to choose each answer you want to select. You must select all correct answers. The stem-and-leaf plot below shows the height measurements of students in an elementary classroom. The mean height of this data is centimeters and the standard deviation (rounded to the nearest hundredth) is Identify each height measurement that is NOT within one standard deviation of the mean. 73 cm 98 cm 74 cm 102 cm 79 cm 103 cm 88 cm 111 cm 11 Which of the following is always a true statement? A A z-score is always zero at the mean. B The mean is the same as a standard deviation of zero. C A z-score can never be bigger than the mean. D If a z-score is smaller than one, then the data value lies below the mean. 12 The number of home runs was recorded for Valley County Schools during the 2009 and 2010 school year. Which of the following statements is NOT true when comparing the two data sets above? A The data from 2010 has less variation and more consistency. B The elements from 2010 are more spread out with respect to the mean. C The data from 2009 is more dispersed than the data set for D The elements from 2009 are more spread out with respect to the mean.

5 13 Directions: Type your answer in the box. The following data was collected during a math lab. cm, -1.0 cm } { 0.8 cm, -0.4 cm, 1.6 cm, 1.1 cm, -1.2 cm, -0.3 cm, -0.6 Find the mean absolute deviation of the data. Round to the nearest thousandth. 14 The box-and-whisker shows the average monthly temperatures in Mathville. What is the range of the temperatures displayed in the box-and-whisker plot? A 40 B 15 C 50 D Click on a box to choose a statement. You must select all correct answers. The box-and-whisker plot shows temperatures in the cities of Blueville and Greenville. Select all statements that are true. The upper quartile of Greenville is greater than the upper quartile of Blueville. The lower quartile of Greenville is greater than the lower quartile of Blueville. The median of Greenville is less than the median of Blueville. The median of Greenville is equal to the upper quartile of Blueville. The median of Greenville is less than the lower quartlie of Blueville.

6 16 Directions: Click and drag a statement to the correct box. Nathan is comparing the total yearly snowfall for two cities, Bloomfield and Emerald. Place the best description next to each city according to the graph. 75% of the snowfall is below 16 inches Greatest interquartile range

7 17 Based on the two box-and-whisker plots, which of the following is a true statement? A Neither data set has an interquartile range of 9. B Both data sets have a range of 14. C Both data sets have a median of 9. D Neither data set has an upper quartile of The quiz averages for two different classes are summarized in the box-and-whisker plots. In Class A, 12 students each received a different quiz average. In Class B, 13 students each received a different quiz average. What is the total number of students, from both classes, that received a quiz average less than an 80? A 9 D 13 B 10 E 15 C 12 F 16

8 19 Which statement is not true about the box and whisker plots? A A female student in the class send 960 text messages in one month. B The percent of data from the lower quartile to the median is 25% for both the girls and boys. C The boys have a larger median than the girls. D The low extreme is the same for both the girls and boys. 20 Select the correct answer. The box and whisker plot represents test scores for two different tests. Test 1 was given to 24 students and Test 2 was given to 16 students. What is the total number of test scores at, or above, 75? A 16 B 18 C 12 D 10

9 21 Directions: Click on a box to choose each statement you want to select. You must select all correct statements. Each of the box-and-whisker plots represent a data set with 12 distinct elements. Identify each true statement about these data sets. There are fewer elements in the upper quartile of set B than of set A. There are more elements in the lower quartile of set B than of set A. The mean is larger in set A than set B. The range of set A and set B are equal. The interquartile range is greater in set A than in set B. The box of set A and set B contain the same number of elements. 22 Select the correct answer. Using a linear regression model, predict the grade of a student who studied for 4 hours. A 90 B 60 C 75 D 85

10 23 The table below gives the number of hours spent studying for a math exam (x) and the exam grade (y). Using a line of best fit, predict the exam grade of a student who studied 5 hours. A 93 B 100 C 96 D Directions: Click and drag each equation to the correct box. Place each equation of the curve of best fit beside the correct set of data. y = -2.4x x y = x x y = -2.14x - 0.4