Question

Using data on average school grade for first-time cigarette use from Monitoring the Future 2008, determine if the average grade is higher for males than for females.

a) Report the t and p values.

b) Is this a one- or a two-tailed test? Explain.

c) List the assumptions made in computing your answer.

Grade First Tried Cigarettes

Males Females

Mean = 4.90 Mean = 4.76

S.D. = 1.74 S.D. = 1.73

N = 150 N = 169

Answer 1