A sample of n = 25 individuals is selected from a population with µ = 80,and a treatment is administered to the sample.What is expected if the treatment has no effect?
A)The sample mean after the treatment should be very different from 80 and should lead you to reject the null hypothesis.
B)The sample mean after the treatment should be very different from 80 and should lead you to fail to reject the null hypothesis.
C)The sample mean after the treatment should be close to 80 and should lead you to reject the null hypothesis.
D)The sample mean after the treatment should be close 80 and should lead you to fail to reject the null hypothesis.

Question

Quizplus · Accepted Answer

If the treatment has no effect, we would expect that the sample mean after the treatment is similar to the population mean of 80. Therefore, the sample mean after the treatment should be close to 80, and we would fail to reject the null hypothesis. Option D is the only choice that reflects this expectation.

A Sample of N = 25 Individuals Is Selected from a Population