7.5 Welch (Unpooled Variance) t Tests and Confidence Intervals: Introduction

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An introduction to Welch (unpooled variance) t tests and confidence intervals. (Inference for two means.)

The Cairo traffic police officer data is simulated data with the same summary statistics as found in:

Kamal, A., Eldamaty, S., and Faris, R. (1991). Blood level of Cairo traffic policemen. Science of the Total Environment, 105:165-170.

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