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10.3 Test for Differences in Means: Assuming Equal Population Variances

Pooling two sample variances when both populations can be assumed to share one spread, buying a tighter estimate and more degrees of freedom than the Welch version.

Introductory Business Statistics 2e, 10.3 Test for Differences in Means: Assuming Equal Population Variances

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1 exercise

10.3 Exercise 1

A drug trial is attempted using a real drug and a pill made of just sugar. 18 people are given the real drug in hopes of increasing the production of endorphins. The increase in endorphins is found to be on average 8 micrograms per person, and the sample standard deviation is 5.4 micrograms. 11 people are given the sugar pill, and their average endorphin increase is 4 micrograms with a standard de…

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