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We wish to design a study to compare two antihypertensive medications. Assume that there is a...

We wish to design a study to compare two antihypertensive medications. Assume that there is a difference of 10 units in the mean decrease in systolic blood pressures between the two medications, and the standard deviation of this difference is 20 units. In order to have 80% chance of claiming that the effectiveness of the two medications are different at a significance level of 5%, how many subjects would be required for each medication?

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Hypothesized mean true mean standard deviation for 0.05 level and two tailed test critival value Ζα/2 for 0.2 level of type I

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