A researcher conducts a hypothesis test to evaluate the effe

A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = 2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision?

Solution

The two tailed P value for z = -2.60 is, using table/technology,

P = 0.009322376

Thus, as this is less than 0.10, 0.05, and 0.01, then we reject the null hypothesis at any of these levels. [ANSWER]