10-1 Inference on the Difference in Means of Two Normal Distributions, Variances Known10-1.1 Hypothesis Tests on the Difference in Means, Variances Known10-1.2 Type II Error and Choice of Sample Size10-1.3 Confidence Interval on the Difference in Means, Variances Known10-2 Inference on the Difference in Means of Two Normal Distributions, Variances Unknown10-2.1 Hypothesis Tests on the Difference in Means, Variances Unknown10-2.2 Type II Error and Choice of Sample Size10-2.3 Confidence Interval on the Difference in Means, Variances Unknown10-3 A Nonparametric Test for the Difference in Two Means10-3.1 Description of the Wilcoxon Rank-Sum Test10-3.2 Large-Sample Approximation10-3.3 Comparison to the t-Test10-4 Paired t-Test10-5 Inference on the Variances of Two Normal Distributions10-5.1 F Distribution10-5.2 Hypothesis Tests on the Ratio of Two Variances10-5.3 Type II Error and Choice of Sample Size10-5.4 Confidence Interval on the Ratio of Two Variances10-6 Inference on Two Population Proportions10-6.1 Large-Sample Tests on the Difference in Population Proportions10-6.2 Type II Error and Choice of Sample Size10-6.3 Confidence Interval on the Difference in Population Proportions10-7 Summary Table and Roadmap for Inference Procedures for Two Samples