A sample of n = 25 individuals is selected from a population with u = 80, and a treatment is administered to
the sample. What is expected if the treatment has no effect?

O The sample mean after the treatment should be very different from 80 and should lead you to fail to
reject the null hypothesis.
O The sample mean after the treatment should be very different from 80 and should lead you to reject the
null hypothesis.
O The sample mean after the treatment should be close 80 and should lead you to fail to reject the null
hypothesis.
O The sample mean after the treatment should be close to 80 and should lead you to reject the null
hypothesis.