1
Stat 2000 International – Final - Answers
1. Correct answer: [1] Students who participated in the survey.
2. Correct answer: [4] The responses you receive should not be considered representative of all
shoppers in the chain because you spoke only with shoppers who were willing to participate in
the survey.
3. Correct answer: [2] cholesterol level
4. Correct answer: [4] The set of 40 answers you receive when you ask the students how many
hours they spend on the Internet per day.
5. Correct answer: [3] Both preceding statements are true.
6. Correct answer: [4] The outlier is a person who has about 8 brothers and weighs about 160
pounds.
7. Correct answer: [2] about 0.65
8. Correct answer: [3] about 0.1061
9. Correct answer: [4] 0.7
10. Correct answer: [3] 0.75
11. Correct answer: [2] about 0.0297
12. Correct answer: [3] For each sample size, the distribution is centered at about the same point,
which also is approximately the population mean. For n = 25, there is less variation among the
different sample means than when n = 9.
13. Correct answer: [3] $0.56
14. Correct answer: [2] about 0.5
15. Correct answer: [4] The manager can be 95% confident that the true average travel time
between customers is between 21.63 and 22.91 minutes.
16. Correct answer: [2] Ha: p < 1/2
17. Correct answer: [3] about 0.1538
18. Correct answer: [4] H0: Population mean = 400; Ha: Population mean < 400
