12. Calculate the sums of squares for the difference scores from the repeated measures study 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 sum of differences, then the mean dierence. Hint: there is only 1 SS to calculate and it comes from D = T2 - T1 You can use either method to get. the 55. Baseline T1 Test T2 13 12 13 13 I" 15 12 9 22 29 5 3 1? 2t] 22 31