8. 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. %3D a. How much difference is there between the mean for the treated sample and the mean for the origi- nal 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 popu- lation mear? That is, find the standard error for M. (Note: In a hypothesis test, this value is the denomi- nator of the t statistic.) c. Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with 05

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