Refer to Exercise 6.37.

Suppose that the agency sponsoring the study specifies that the group receiving the drug should have twice as many patients as the placebo group. Determine the sample sizes necessary for an α = .05 t test to have a power of .80 to detect an increase of 5 mm Hg in the blood pressure of the treatment group relative to that of the placebo group.

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Mean Standard Deviation Group Placebo Anti-inflammatory drug 129.9 135.5 18.5 18.7