13.1 Introduction13.2 Hypothesis Testing for the Difference Between Two Population Means Using the z Statistic13.3 Hypothesis Testing for the Difference Between Two Population Means Using the t Statistic (Case of a Small Random Sample, n1, n2 < 30, When Population Standard Deviation is Unknown)13.4 Statistical Inference About the Difference Between the Means of Two Related Populations (Matched Samples)13.5 Hypothesis Testing for the Difference in Two Population Proportions13.6 Hypothesis Testing About Two Population Variances (F Distribution)SummaryKey TermsDiscussion QuestionsNumerical ProblemsCase Study