Suppose you are reading about a statistically significant result x (just at level α) from a one-sided test T+ of the mean of a Normal distribution with n iid samples, and (for simplicity) known σ:   H0: µ ≤  0 against H1: µ >  0.  I have heard some people say [0]: A. If the test’s power to detect alternative µ’ is very low, … Continue reading Telling What’s True About Power, if practicing within the error-statistical tribe