7. The analysis of a random sample of 500 pilots who fly into and out of JFK indicates that a 98% CI for their mean annual income is [$41,300, $58,630]. Could this informa- tion be used to conduct a hypothesis test given Ho: = $40,000 and H: for a = .02?

a. No. It is not known whether the data are normally distributed.

b. No. The entire data set is needed to do this test. $40,000

c. Yes. Because $40,000 is not within the 98% CI, the decision would be to reject Ho and conclude the mean annual income is significantly different from $40,000 for = .02.

d. Yes. Because $40,000 is not within the 98% Cl, the decision would be to fail to reject Ho and that the mean annual income is not significantly different from $40,000 for a = .02.