A researcher is testing a hypothesis of a single mean.The critical z value for $\alpha$ = .05 in a two-tailed test is +1.96.The observed z value from sample data is -2.11.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
E)restate

Question

Quizplus · Accepted Answer

Since the observed z value (-2.11) is beyond the critical z value (+/-1.96) in the negative direction for a two-tailed test at α = .05, the correct decision 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 $\alpha$