A researcher obtains z = 2.04 for a one-sample z test.What is the decision for this test at a .05 level of significance?
A) to reject the null hypothesis
B) to retain the null hypothesis
C) it depends on whether the test is one-tailed or two-tailed
D) there is not enough information to make a decision

Question

Quizplus · Accepted Answer

In one-sample z test, the null hypothesis is rejected if the calculated value of z is greater than the critical value of z. At a 0.05 level of significance, the critical value of z is 1.96 for a two-tailed test. Since the calculated value of z is 2.04 which is greater than 1.96, we reject the null hypothesis. Therefore, the decision is to reject the null hypothesis.

A Researcher Obtains Z = 2