need fast and correct the answer.....

A sample of n = 50 individuals is selected from a population with u = 25, and a treatment is administered to the sample. What sample mean M after the treatment is expected if the treatment had a significant effect? The sample mean M should be very different from the population mean u = 25 and should result in failing to reject the null hypothesis. The sample mean M should be very close to the population mean u = 25 and should result in rejecting of the null hypothesis. The sample mean M should be close to the population mean u # 25 and should result in failing to reject the null hypothesis. The sample mean M should be very different from the population mean u = 25 and should result in rejecting of the null hypothesis