A professor of women\'s studies is interested in determining if stress affects t

Question

A professor of women's studies is interested in determining if stress affects the menstrual cycle. Ten women are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to high stress for two months while the other lives in a relatively stress-free environment. The professor measures the menstrual cycle (in days) of each woman during the second month. The following data are obtained.

High stress
20
23
18
19
22
Relatively stress free
26
31
25
26
30


Refer to Exhibit 14-1. Estimate the size of the effect. = ____

1. 0.4322
2. 0.5776
3. 0.6810
4. 0.8102

Explanation / Answer

1. 0.4322

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