A newly developed commercial ad aims to enhance college students' attitude toward a chocolate brand (1 as very negative and 100 as very positive). To evaluate the effectiveness of the new ad, a sample of 12 students (6 male, 6 female) was randomly chosen in a university. The 12 students first reported their brand attitude before watching the ad, and then reported another brand attitude after watching the ad. Below are the recorded brand attitude scores among the 12 students.

Attitude Before the Ad Attitude After the Ad Student # Male Student # Female Student # Male Student # Female 95 60 95 7 75 2 45 OO 35 2 85 8 65 W 60 9 40 3 80 9 55 4 70 10 55 4 75 10 70 5 70 11 75 5 90 11 95 6 60 12 80 6 85 12 100