1. The scores for a group of students (Group 1) who did the review packet and for a group (Group 2) who did not
were recorded. A 95% confidence interval for μ_1-μ_2 was computed as (32 points, 40 points). Which of the following is a
correct interpretation of this interval?
a. We are 95% confident that the mean score for all Group 1 students is between 32 points and 40 points.
b. We are 95% confident that the mean score between all Group 1 students and all Group 2 students falls between
32 points and 40 points.
c. We are 95% confident that the mean score for a sample of Group 1 students is between 32 points and 40 points
more than that of the sample of Group 2 students.
d. We are 95% confident that the mean score for all Group 1 students is 32 points and the mean score
for all Group 2 students is 40 points.
e. We are 95% confident that the mean score for all Group 1 students is between 32 points and 40 points more
than that of all Group 2 students.