Practical Data Analysis with JMP, Second Edition, 2nd Edition

13 Two-Sample Inference for a Continuous Variable

Overview

Conditions for Inference

Using JMP to Compare Two Means

Assuming Normal Distributions or CLT

Using Sampling Weights (optional section)

Equal vs Unequal Variances

Dealing with Non-Normal Distributions

Using JMP to Compare Two Variances

Application

Overview

At the end of the prior chapter, we studied the matched pairs design to make inferences about the mean of differences within a population. In this chapter, we take up the comparison of samples drawn independently from two different populations, and learn to estimate the differences between population means and variances. The procedures discussed here assume that samples are randomized (and therefore representative) and are a comparatively ...