Calculate Power Given Sample Size. Statistical power is a fundamental consideration when designing research experiments. P Z.
P Z. N 1645 2 05 1 -. 02415 1 0999356.
Generally we want power to be as high as possible.
Dallal 1997 wwwtuftsedugdallalSIZEHTM where n represents the required sample size per group. Power 1β is the probability of avoiding a type II error. 02415 1 0999356. Conventional practice is to determine the sample size that gives 80 power at the 005 level of significance two-sided.
