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)fail to reject
C)redefine
D)change the alternate hypothesis into
E)restate the null hypothesis

Question

Quizplus · Accepted Answer

The observed z value (2.85) is greater than the critical z value (1.96), which means that we reject the null hypothesis at the 0.05 level of significance.

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

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