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 -2.11.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

Question

Quizplus · Accepted Answer

The observed z value falls in the rejection region (-1.96 to -infinity for a two-tailed test), so the researcher should 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 $\alpha$