Testing Two Population Means and Proportions
The ability to compare two population parameters is both useful and important in expanding the roles estimation and hypothesis testing can play in analyzing sample data. In this chapter, we continue our discussion of population means, variances, and proportions, but we develop the analysis to compare differences between two population means and differences between two proportions. The underlying logic of hypothesis testing remains unchanged.
We encounter several complexities in expanding our analysis to two populations that we did not find in dealing with a single population. In analyzing differences between population means, we separate those that are estimated with independent samples ...
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