Suppose that in the previous question the 95% confidence interval on the difference between group means was computed to be 2.63 ≤ µ1 - µ2 ≤ 13.37. What can we conclude about the null hypothesis of no treatment effect?
A) The difference is significant.
B) The difference is not significant.
C) The treatment doesn't work.
D) Confidence intervals are totally unsuited to this question.

Question

Suppose that in the previous question the 95% confidence interval on the difference between group means was computed to be 2.63 ≤  µ1 -  µ2  ≤ 13.37. What can we conclude about the null hypothesis of no treatment effect?
A) The difference is significant.
B) The difference is not significant.
C) The treatment doesn't work.
D) Confidence intervals are totally unsuited to this question.

Quizplus · Accepted Answer

Since the confidence interval does not include zero, we can conclude that there is a significant difference between the two groups and reject the null hypothesis of no treatment effect.

Suppose That in the Previous Question the 95% Confidence Interval