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Treated sample and mean for the original population

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A random sample of n 25 individuals is selected from a population with 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 difference 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.

Reference no: EM132857892

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