A researcher conducts a positive test to evaluate the effect of a treatment that is expected to increase scores. The hypothesis test produces a z-statistic of z = 2.37. If the researcher is using a one-tailed test, what is the correct statistical decision?

A) Reject the null hypothesis with a=0.05 but not with a=0.01

B) Reject the null hypothesis with either a=0.05 or a=0.01

C) Fail to reject the null hypothesis with either a=0.05 or a=0.01

D) Cannot answer without additional information.