A random sample of n = 25 individuals is selected from a population with u = 20, and a treatment is administered to each individual in the sample.  After treatment, the sample mean is found to be M = 22.2 with SS = 384. PLEASE SHOW HOW YOU GOT YOUR Answer. a. How much difference is there between the mean for the original population?  (Note; In a hypothesis test, this value forms the numerator of the t statistic.) b. If there is no treatment effect, how much difference is expected between the sample mean and its population mean?  That is, find the standard error for M.

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