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d. u > 50 LO10 2. A researcher predicts that a treatment will increase scores. To test the treat- ment effect, a sample of n = 16 is selected from a population with u = 80 and a treatment is administered to the individuals in the sample. After treat- ment, the sample mean is M = 78 with s2 = 16. If the researcher uses a one- tailed test with a = .05, then what decision should be made? a. Reject Ho with a = .05 or with a = .01 b. Fail to reject Ho with a = .05 or with a = .01 c. Reject Ho with a = .05 but not with a = .01 d. Reject Ho with a = .01 but not with a = .05 010 3. A researcher fails to reject the null hypothesis with a regular two-tailed test