Classroom Activity 7 Math 113 Name : 10 pts Intro to Applied Stats
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1 Classroom Activity 7 Math 113 Name : 10 pts Intro to Applied Stats Materials Needed: Bags of popcorn, watch with second hand or microwave with digital timer. Instructions: Follow the instructions on the bags of popcorn, do NOT simply hit the popcorn button on the microwave. Popping Instructions Brand 1 - ACT II Popcorn Pop on HIGH at full power until bag expands and popping slows to 1-2 seconds between pops. Normal popping time is 2-5 minutes. Brand 2 - Orville Redenbacher Popcorn Pop on HIGH (full power) until rapid popping slows to 2-3 seconds between pops. Normal popping time is between 2 and 5 minutes. Do the following for each bag. 1. Pop the popcorn. 2. Record the number of seconds before the first kernel pops. 3. Let the popcorn pop until the popping slows to the rate indicated in the instructions. 4. Open the bag. Count and record the number of popped and un-popped kernels. 1. Record your results in the table below. Record times in seconds. ACT II Redenbacher Total Seconds until first kernel pops Total Popping Time (sec) Number of popped kernels Number of un-popped kernels Total number of kernels Percentage of popped kernels Give your data to the instructor who will make it available to the class. You can go ahead and answer question 2 while waiting on the classroom data. Problems 3 and 4 use the class data.
2 2. Using your data only, test the claim that at the 0.10 level of significance, there is no difference in the proportion of popped kernels (sect 8.4). a. We re testing two proportions. Proportions are based on the binomial experiment, so let s verify the conditions of a binomial experiment. For each bag of popcorn, were there a fixed number of independent trials each having only two outcomes? If not, explain why. b. All of our parametric hypothesis testing involves normality in some manner. How is that requirement satisfied for this type of test? i. The number of kernels popped is normally distributed (use qq-plot to test) c. Write the original claim symbolically. d. The original claim is the hypothesis. e. Write the null hypothesis and alternative hypotheses: f. This is a (left tail / right tail / two tail) test. g. The level of significance is " =. h. We will be using the ( uniform / binomial / normal / student s t / chi-square / F ) i. The critical value(s) is/are. j. The test statistic is. k. The probability value is. l. The test statistic ( does / does not ) lie in the critical region. m. The decision is to ( reject / fail to reject ) the null hypothesis. n. There is ( sufficient / insufficient ) evidence to ( reject / support ) the claim that there is no difference in the proportion of popped kernels between Act II and Orville Redenbacher. o. There is ( sufficient / insufficient ) evidence to ( reject / support ) the claim that there is a difference in the proportion of popped kernels between Act II and Orville Redenbacher.
3 3. Use the combined class data to test the claim at the 0.10 level of significance that there is no difference in the first kernel popping time of the two brands using the dependent case (sect 8.3) by forming a new random variable which is the difference between Act II and Orville Redenbacher s (let d = Act II - Redenbacher). n d a. All of our parametric hypothesis testing involves normality in some manner. How is that requirement satisfied for this type of test? i. First kernel popping times are normally distributed (use qq-plot to test). b. Write the original claim symbolically. c. The original claim is the ( null / alternative ) hypothesis. d. Write the null and alternative hypotheses: e. This is a (left tail / right tail / two tail) test. f. The level of significance is " =. g. We will be using the ( uniform / binomial / normal / student s t / chi-square / F ) h. The critical value(s) is/are. i. The test statistic is. j. The probability value is. k. The test statistic ( does / does not ) lie in the critical region. l. The decision is to ( reject / fail to reject ) the null hypothesis. m. There is ( sufficient / insufficient ) evidence to ( reject / support ) the claim that there is no difference in the first kernel popping time. n. There is ( sufficient / insufficient ) evidence to ( reject / support ) the claim that there is a difference in the first kernel popping time. s d
4 4. Use the combined class data to test the claim at the 0.10 level of significance that there is no difference in the total popping times using the independent case (sect 8.6) by finding the mean and standard deviations of each brand individually and then comparing. n x Act II Redenbacher Since we re testing the difference of two means with small sample sizes and unknown population variances, we need to know whether the variances are equal or not. s a. Conduct an F-test to see if the variances are equal (sect 8.5). σ = σ i. The claim that is the ( null / alternative ) hypothesis. ii. Write the null and alternative hypotheses. iii. This is a ( left tail / two tail / right tail ) test. iv. We will be using the ( uniform / binomial / normal / student s t / chi-square / F ) v. The test statistic is. vi. vii. viii. The critical value is. The decision is to (reject / fail to reject) the null hypothesis that the variances are equal. We will assume that the variances are (equal / unequal). If you fail to reject the claim that the variances are equal, then you must use the pooled variance, and the degrees of freedom is the sum of the two degrees of freedom. If you reject the claim that the variances are equal, then you use each variance, and the degrees of freedom is the smaller of the two degrees of freedom.
5 Either way, we now resume with the test about the difference of the means (sect 8.6). b. All of our parametric hypothesis testing involves normality in some manner. How is that requirement satisfied for this type of test? i. Total popping times are normally distributed (use qq-plot to test). c. Write the original claim symbolically. d. The original claim is the hypothesis. e. Write the null and alternative hypotheses: f. This is a (left tail / right tail / two tail) test. g. The level of significance is " =. h. We will be using the ( uniform / binomial / normal / student s t / chi-square / F ) i. We ( will / will not ) be using the pooled variance in this case. j. The degrees of freedom is. k. The critical value(s) is/are. l. The test statistic is. m. The probability value is. n. The test statistic ( does / does not ) lie in the critical region. o. The decision is to ( reject / fail to reject ) the null hypothesis. p. There is ( sufficient / insufficient ) evidence to ( reject / support ) the claim that there is no difference in the total popping time of the two brands. q. There is ( sufficient / insufficient ) evidence to ( reject / support ) the claim that there is a difference in the total popping time of the two brands.
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