The question was: The lower limit on the difference between the charismatic instructor's and the punitive instuctor's rating based on the 95% confidence interval is

Correct Answer: 0.068

Explanation: The95% confidence interval is given in the column labeled "95% CI for Diff" and has 0.068 as its lower bound. The same value is obtained whether or not homogeneity of variance is assumed (row with "Equal" in first column) or not assumed (row with "Unequal" in first column).

 

t-test for Equality of Means
Variances t-value df 2-Tail SIG SE of Diff 95% CI for Diff
Equal
2.45
47
0.018
0.154
(0.068, 0.686)
Unequal
2.45
46.83
0.018
0.154
(0.068, 0.687)