Introduction to Biostatistics with JMP

Chapter 9: Tests of Differences Between Two Groups

It doesn’t make a difference how beautiful your guess is, it doesn’t make a difference how smart you are, who made the guess, or what his name is. If it disagrees with [the] experiment, it’s wrong.

Richard Feynman

Introduction

Comparing Two Unrelated Samples and Bone Density

Applying Statistical Strategy

Preferences of Use

Null Hypotheses

The Categorical Variable and Data Format

Let’s Do It Already!

The Nonparametric Alternative

Comparing Two Related Samples and Secondhand Smoke

Blowing Smoke

Clearing the Fog

But Wait! There’s More!

Introduction

We now turn to the tests found on the left branch of our master flowchart in Figure 2.2 in Chapter 2, in which our primary objective is to determine ...