9112 Incorrectly posed hypotheses What is wrong with express

9.112 Incorrectly posed hypotheses What is wrong with expressing hypotheses about proportions and means in a form such as H0:p = 0.50a nd H0:x bar = 0?

Solution

both of these are testing sample statistics, which is wrong because we already know the value of sample statistics (obtained from the samples). Hypothesis are always tested for population parameter, like p and mu instead of p-hat or x-bar