A researcher is testing a hypothesis of a single mean.The critical z value for $\alpha$ = .05 and a two-tailed test is +1.96.The observed z value from sample data is 2.85.The decision made by the researcher based on this information is to ___ the null hypothesis.
A)reject
B)not reject
C)redefine
D)change the alternate hypothesis into
E)restate the null hypothesis

Question

Quizplus · Accepted Answer

The observed z value of 2.85 is greater than the critical z value of 1.96. This means that the sample mean is significantly different from the hypothesized mean, and we can reject the null hypothesis at the 0.05 level of significance. Therefore, the best choice is to reject the null hypothesis.

A Researcher Is Testing a Hypothesis of a Single Mean α\alphaα

A Researcher Is Testing a Hypothesis of a Single Mean $\alpha$