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

Question

Quizplus · Accepted Answer

The observed z value (2.85) is greater than the critical z value (+1.96) at a significance level of .05, indicating that the sample mean is significantly different from the hypothesized population mean. Therefore, the null hypothesis is rejected in favor of the alternative hypothesis.

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

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