1. The problem statement, all variables and given/known data Having trouble understanding the question, which is... voltage specified to be 130 Sample of 20 readings gives sample mean of 128.25 Also given s.d.=3. "It is important that the voltage not be allowed to drop below 128 volts. What is the probability of rejecting mean of 130 at the 1% level if in fact the mean is 128? 2. Relevant equations this is part c, already tested the hypothesis regarding the true mean and found the critical value for 1%. 3. The attempt at a solution I think this involves bayesian methods but the language (grammar) of the question confuses me, if someone could restate it that would be great.