How much power did the study have for detecting a significant difference between groups (using a two-sided
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How much power did the study have for detecting a significant difference between groups (using a two-sided test with a 5% level of significance) if the true effect of the SMI intervention is to reduce mean DBP by 2 mm Hg more than the control group and the standard deviation of change within a group is 6 mm Hg?
The results for the control group (n = 320) at the end of the study were as follows:
Mean (change) = −4.77 mm Hg,
sd (change) = 6.09 mm Hg.
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