10. A random sample of n = 25 individuals is selected from a population with p = 20, and a treatment is administered to

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10 A Random Sample Of N 25 Individuals Is Selected From A Population With P 20 And A Treatment Is Administered To 1 (153.54 KiB) Viewed 39 times

10. A random sample of n = 25 individuals is selected from a population with p = 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. a. How much difference is there between the mean for the treated sample and 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 differ- ence is expected between the sample mean and its population mean? That is, find the standard error for M. (Note: In a hypothesis test, this value is the denominator of the t statistic.) c. Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with a = .05.