red_pe_ch_10.pdf

# So the sample is unbiased chapter review 459 107

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So, the sample is unbiased.

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Chapter Review 459 10.7 Comparing Populations (pp. 448– 453) The double box-and-whisker plot shows the test scores for two French classes taught by the same teacher. 56 72 64 80 68 60 76 84 88 96 92 100 Score Class B Class A a. Compare the populations using measures of center and variation. Both distributions are skewed left, so use the median and the IQR. The median for Class A, 92, is greater than the median for Class B, 88. The IQR for Class B, 12, is greater than the IQR for Class A, 8. The scores in Class A are generally greater and have less variability than the scores in Class B. b. Express the difference in the measures of center as a multiple of each measure of variation. median for Class A median for Class B ———— IQR for Class A = 4 8 = 0.5 median for Class A median for Class B ———— IQR for Class B = 4 12 = 0.3 So, the difference in the medians is about 0.3 to 0.5 times the IQR. 23. You want to estimate the number of students in your school whose favorite subject is biology. You survey the first 10 students who arrive at biology club. Determine whether the sample is biased or unbiased . Explain. 24. SPANISH TEST The double box-and-whisker plot shows the test scores of two Spanish classes taught by the same teacher. a. Compare the populations using measures of center and variation. b. Express the difference in the measures of center as a multiple of each measure of variation. 67 79 73 85 76 70 82 88 91 97 94 100 Score Class B Class A
460 Chapter 10 Probability and Statistics Chapter Test 10 Test Practice You randomly choose one game piece. (a) Find the number of ways the event can occur. (b) Find the favorable outcomes of the event. 1. Choosing green 2. Choosing not yellow 3. Use the Fundamental Counting Principle to find the total number of different sunscreens possible. Use the bar graph to find the experimental probability of the event. 4. Rolling a 1 or a 2 5. Rolling an odd number 6. Not rolling a 5 Use the spinner to find the theoretical probability of the event(s). 7. Spinning an even number 8. Spinning a 1 and then a 2 You randomly choose one chess piece. Without replacing the first piece, you randomly choose a second piece. Find the probability of choosing the first piece, then the second piece. 9. Bishop and bishop 10. King and queen 11. LUNCH You want to estimate the number of students in your school who prefer to bring a lunch from home rather than buy one at school. You survey five students who are standing in the lunch line. Determine whether the sample is biased or unbiased . Explain. 12. AGES The double box-and-whisker plot shows the ages of the viewers of two television shows in a small town. a. Compare the populations using measures of center and variation. b. Express the difference in the measures of center as a multiple of each measure of variation.

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