1) Use a 0.05 significance level to test the claim that people exposed to tobacco smoke have a higher mean cotinine level than people not exposed to tobacco smoke. Exposed to smoke Not exposed to smoke 1 = 40 2 = 4 1 = 60.58 ng/mL 2 = 16.35 ng/mL 1 = 138.08 ng/mL 2 = 62.53 ng/mL

Null and Alternative hypotheses:

Test Statistic:

Critical Value(s):

Decision:

2) Use a 0.05 level of significance to test the claim that there is no difference in heights between mothers and their first daughters. Height of Mother 68 60 61 63.5 69 Height of Daughter 68.5 60 63.5 67.5 68

Null and Alternative hypotheses:

Test Statistic:

Critical Value(s):

Decision: