What does it mean if a researcher said she rejected the null hypothesis at the .05 level?
A)There was less than a 5% chance that she would have gotten such an extreme result by chance if the null hypothesis were true.
B)There was more than a 5% chance that she would have gotten such an extreme result by chance if the null hypothesis were true.
C)There is a 5% chance that there is a difference between the two populations she is testing if the null hypothesis were true.
D)There is a 95% chance that the research hypothesis is true.

Question

Quizplus · Accepted Answer

Rejecting the null hypothesis at the .05 level means that the p-value, or probability value, associated with the hypothesis test was less than .05. This indicates that there was less than a 5% chance that the researcher would have obtained the observed result if the null hypothesis were true. As this probability level is usually considered statistically significant, the researcher can conclude that there is evidence of a difference between the populations being compared.

What Does It Mean If a Researcher Said She Rejected