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Chapter 5: Working with Two or More Groups of Variables

The Problems: Comparing Blend Uniformity and Content Uniformity, Average Flow of Medication, and Differences Between No-Drip Medications. 99

Comparison of Two Quantitative Variables. 100

Comparison of Two Independent Means. 106

Unequal Variance Test 109

Matched Pairs Tests. 111

More Than Two Groups. 113

Practical Conclusions. 124

Overview

Technical professionals regularly deal with problems that involve more than one variable. It is typical for a team to be interested in either a relationship between two measurable entities or in a measurable entity that might come from two groups. The pharmaceutical and medical device industries typically do not lack data. ...

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