If a 95 percent confidence interval about a difference between means is 2.31 to 24.62, the null hypothesis may be
A) rejected at the .01 level
B) rejected at the .05 level
C) rejected at the .001 level
D) retained.

Question

Quizplus · Accepted Answer

Since the 95 percent confidence interval does not include 0, it indicates that there is a statistically significant difference between the means at the 0.05 level. This means the null hypothesis, which typically posits no difference, can be rejected at the 0.05 level. Confidence intervals that do not include the null value (in this case, a difference of 0) suggest significance at the corresponding confidence level.

If a 95 Percent Confidence Interval About a Difference Between