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11. Which of the following statements are true? (Check one)

I. A sample survey is an example of an experimental study.

II. An observational study requires fewer resources than an experiment.

III. The best method for investigating causal relationships is an observational study.

(A) I only

(B) II only

(C) III only

(D) All of the above.

(E) None of the above.

12. Suppose we want to estimate the average weight of an adult male in Dekalb County, Georgia. We draw a random sample of 1,000 men from a population of 1,000,000 men and weigh them. We find that the average man in our sample weighs 180 pounds, and the standard deviation of the sample is 30 pounds. What is the 95% confidence interval.

(A) 180 + 1.86

(B) 180 + 3.0

(C) 180 + 5.88

(D) 180 + 30

(E) None of the above.

13. The stemplot below shows the number of hot dogs eaten by contestants in a recent hot dog eating contest.

80

70

60

50

40

30

20

10 1

4 7

2 2 6

0 2 5 7 9 9

5 7 9

7 9

1

Which of the following statements are true?

I. The range is 70.

II. The median is 46.

III. The mean is 47.

(A) I only

(B) II only

(C) III only

(D) I and II

(E) I, II, and III

14. The number of adults living in homes on a randomly selected city block is described by the following probability distribution.

Number of adults, x 1 2 3 4 or more

Probability, P(x) 0.25 0.50 0.15 ???

What is the probability that 4 or more adults reside at a randomly selected home?

(A) 0.10

(B) 0.15

(C) 0.25

(D) 0.50

(E) There is not enough information to answer this question.

15. A major metropolitan newspaper selected a simple random sample of 1,600 readers from their list of 100,000 subscribers. They asked whether the paper should increase its coverage of local news. Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?

(A) 0.30 to 0.50

(B) 0.32 to 0.48

(C) 0.35 to 0.45

(D) 0.37 to 0.43

(E) 0.39 to 0.41

11. Which of the following statements are true? (Check one)

I. A sample survey is an example of an experimental study.

II. An observational study requires fewer resources than an experiment.

III. The best method for investigating causal relationships is an observational study.

(A) I only

(B) II only

(C) III only

(D) All of the above.

(E) None of the above.

12. Suppose we want to estimate the average weight of an adult male in Dekalb County, Georgia. We draw a random sample of 1,000 men from a population of 1,000,000 men and weigh them. We find that the average man in our sample weighs 180 pounds, and the standard deviation of the sample is 30 pounds. What is the 95% confidence interval.

(A) 180 + 1.86

(B) 180 + 3.0

(C) 180 + 5.88

(D) 180 + 30

(E) None of the above.

13. The stemplot below shows the number of hot dogs eaten by contestants in a recent hot dog eating contest.

80

70

60

50

40

30

20

10 1

4 7

2 2 6

0 2 5 7 9 9

5 7 9

7 9

1

Which of the following statements are true?

I. The range is 70.

II. The median is 46.

III. The mean is 47.

(A) I only

(B) II only

(C) III only

(D) I and II

(E) I, II, and III

14. The number of adults living in homes on a randomly selected city block is described by the following probability distribution.

Number of adults, x 1 2 3 4 or more

Probability, P(x) 0.25 0.50 0.15 ???

What is the probability that 4 or more adults reside at a randomly selected home?

(A) 0.10

(B) 0.15

(C) 0.25

(D) 0.50

(E) There is not enough information to answer this question.

15. A major metropolitan newspaper selected a simple random sample of 1,600 readers from their list of 100,000 subscribers. They asked whether the paper should increase its coverage of local news. Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?

(A) 0.30 to 0.50

(B) 0.32 to 0.48

(C) 0.35 to 0.45

(D) 0.37 to 0.43

(E) 0.39 to 0.41

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