Suppose you calculated a 95 percent confidence interval about the difference between two paired means. The resulting confidence interval was -2.10 to 2.10. Knowing this, you can
A) reject the null hypothesis at the .05 level
B) reject the null hypothesis at the .01 level
C) retain the null hypothesis
D) additional information is needed.

Question

Quizplus · Accepted Answer

The confidence interval includes 0, which suggests that the difference between the two means could be 0. This means there is not enough evidence to reject the null hypothesis at the .05 level, as the null hypothesis typically posits no difference or effect.

Suppose You Calculated a 95 Percent Confidence Interval About the Difference