ABSTRACT
Introduction In Chapter 10, we showed how to test a hypothesis about a population mean by using a single sample mean drawn from that population. In this instance, we tested if the hypothesized populaK tion mean (i.e., the parameter) was statistically different from the sample mean (i.e., the statistic). In Chapter 11, the analysis was extended to comparing whether two population means were staK tistically different by comparing two sample means-one drawn from each sample. Depending on the circumstance, the appropriate test statistic was either the z-score or r-statistic.
