Calculate the sums of squares for the difference scores below. Eight people were measured twice. Subtract it T2 - T1 (this way an increase will be a positive score, a decrease will be a negative score). Be careful of positive and negative values when you are calculating differences and adding them to get the mean difference.

Baseline T1	Test T2
14	11
18	6
5	15
12	9
22	21
3	4
17	20
22	31