QUESTIONS A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = 2.37. Assuming that the researcher is using a two-tailed test, what decision should be made? O a. The researcher should fail to reject Ho with either a = .05 or a = .01. O b. The researcher should ignore the results. O c. The researcher should reject the null hypothesis with a = .05 but not with a = .01. O d. The researcher should reject the null hypothesis with either a = .05 or a = .01