The following data represent the result of a study:

Find Own Solution Memorization of Solution

n = 8 n = 8

M = 10.50 M = 6.16

SS = 108 SS = 116

a. Is there a significant difference in performance on new problems for these two groups? Use a two-tailed test with a alpha = .05.

b. Construct a 90% confidence interval to estimate the size of the mean difference.