A researcher obtains z = 1.80 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.

Question

Quizplus · Accepted Answer

The decision depends on whether the test is one-tailed or two-tailed. For a two-tailed test at a .05 significance level, the critical z-values are approximately ±1.96, so you would retain the null hypothesis. For a one-tailed test, the critical z-value is approximately 1.645, so you would reject the null hypothesis if the test is in the direction of the tail.

A Researcher Obtains Z = 1