Question

A SRS of 20 commuters to the Los Angeles metropolitan area are selected, and each is asked how far they commute to work each day. In the sample, the mean distance is 64 miles and the standard deviation is 12 miles. Assume that in the population of all commuters to the Los Angeles metropolitan area, daily commuting distance follows a normal distribution, with some mean μ. 23. We are interested in a 95% confidence interval for the population mean commuting distance. The margin of error associated with the confidence interval is a. 2.68 miles. b. 4.64 miles. c. 5.62 miles. d. 6.84 miles. 24. A 90% confidence interval for the population mean commuting distance based on these data is a. 64 ± 2.68 miles. b. 64 ± 4.64 miles. c. 64 ± 5.62 miles. d. 64 ± 6.84 miles.

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