7. When n is small (less than 30), how does the shape of the t distribution compare to the normal distribution?

a. It is almost perfectly normal.

b. It is flatter and more spread out than the normal distribution.

c. It is taller and narrower than the normal distribution.

d. There is no consistent relationship between the t distribution and the normal distribution.

8. With = .05, the two-tailed critical region for a t-test using a sample of n = 14 subjects would have boundaries of ______. Consult the t-distribution table at the end for the information that you need.

a.t = 1.761

b.t = 2.145

c.t = 2.16

d.t = 2.977

9. A sample has a mean of M = 39.5 and a standard deviation of s = 4.3, and produces a t-statistic of t = 2.14. For a two-tailed hypothesis test with = .05, what is the correct statistical decision for this sample?

a.The researcher can reject the null hypothesis with = .05 but not with = .01.

b.The researcher can reject the null hypothesis with either = .05 or = .01.

c.The researcher must fail to reject the null hypothesis with either = .05 or = .01.

d.It is impossible to make a decision about H0 without more information.