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7. Imagine that you are undertaking a study of bus drivers in Los Angeles, California. You find that the mean

number of miles driven by all drivers is 35,500 per year, with a standard deviation of 5,000. In a sample of 22 bus drivers from an affluent area of the city, you find that the number of miles driven is normally distributed, with a mean of 32,000 miles per year. Based on research from other cities, you suspect that bus drivers in the affluent area will drive significantly fewer miles than the typical bus driver. 

Presuming that α = .10:

a) Indicate whether a one- or two-tailed test would be appropriate and explain why. (2 points)

b) State appropriate null and alternate hypotheses in notational form.

(2 points)

c) Indicate whether a t or z statistic would be appropriate in step 2 of hypothesis testing and explain why. (2 points).

d) Define a Type I error and indicate what its value would be? (2 points)

Top Answer

(a) one tail test would be appropriate here because we suspect bus drivers in the affluent area to drive significantly fewer... View the full answer

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