In many studies examining the association between estrogens and endometrial cancer of the uterus, a one-sided significance test was used. The underlying assumption justifying a one-sided rather than a two-sided test is:

In many studies examining the association between estrogens and endometrial cancer of the uterus, a one-sided significance test was used. The underlying assumption justifying a one-sided rather than a two-sided test is:



a. The distribution of the proportion exposed followed a "normal" pattern

b. The expectation before doing the study was that estrogens cause endometrial cancer of the uterus

c. The pattern of association could be expressed by a straight-line function

d. Type II error was the most important potential error to avoid

e. Only one control group was being used



Answer: b. The expectation before doing the study was that estrogens cause endometrial cancer of the uterus


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