# 9-) A sample of 50 students is taken from Utah Valley University (UVU).

These students spent an average of $175 on books this semester, with a standard deviation of $25. A 95% confidence interval for the average amount of money spent on books for all students at UVU is equal to ____. (Hint: Use Excel function to obtain the critical value.)

A. 175 ± 7.18

B. 175 ± 3.86

C. 175 ± 3.47

D. 175 ± 7.51

10-) The upper limit of 90% confidence interval for the population proportion P, given a sample size n = 300 and sample proportion = 0.1833 is equal to:

A. 0.2271

B. 0.1466

C. 0.2200

D. 0.1395

11-) The number of television sets produced from an assembly line each day is known to have a standard deviation of 17.4 sets per day. The production line averaged 452.3 sets per day for 20 randomly selected days. Which of the following represents a 95% confidence interval for the population mean number of sets per hour?

A. 452.3 ± 9.4

B. 452.3 ± 7.63

C. 452.3 + 11.3

D. 452.3 ± 13.8

12-) The manager of the local health club is interested in determining the number of times members use the weight room per month. She takes a random sample of 15 members and finds that over the course of a month, the average number of visits was 11.2 with a standard deviation of 3.2. Assuming that the monthly number of visits is normally distributed, which of the following represents a 95% confidence interval for the average monthly usage of all health club members?

A. 11.2 ± 1.62

B. 11.2 ± 1.83

C. 11.2 ± 1.74

D. 11.2 ± 1.77

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