Psychological tests are often used to determine the hostility levels in people. High scores on the HLT psychological test corresponds to high hostility levels. Suppose that 26 college students, all with equally high HLT test scores, were randomly selected and separated into two groups randomly. Group 1 (10 students) was treated for high hostility levels by using Method A; whereas Group 2 (16 students) was treated for high hostility levels by using Method B. Both groups were treated for a period of 5 months, at which time all 26 students were again given the HLT test. The differences computed are based on Group 1 scores minus Group 2 scores.

The 95% confidence interval for the difference in the mean scores of the two treatment methods is (11.34,1.34)(11.34,1.34). Based on this interval, select the best answer below.