Power curve for comparing 2 proportions
Test compares percentage response in treated group with response in control group.
Size of test (two-tailed
a) = 0.05
- %c = Percent response with control treatment.
- Do = increase in response with new treatment, under Ho. (usually 0)
- nc = sample size for control treatment.
- nt = sample size for new treatment.
- Do + D = increase in response under Ha.
Graph shows probability of rejecting Ho in favour of Ha, as a function of D.
power curve for test based on referring test statistic
to the Normal distribution.
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