What is the Sum of Squares between? What is the sum of squares within ?

Text X2 Video X2 Phone X2 Message Chat Conversation 10 100 12 144 9 81 9 81 15 225 8 64 7 49 16 256 10 100 10 100 18 324 7 49 11 121 10 100 5 25 8 64 18 324 12 144 9 81 16 256 11 121 12 144 17 289 10 100 10 100 15 225 7 49 4 16 14 196 8 64 5 25 13 169 10 100 6 36 14 196 5 25 10 100 15 225 10 100 6 36 12 144 10 100 7 49 10 100 3 9 n 15 15 15 EX 124 215 125 M 8.27 14.33 8.33 E(X2) (EX)2 N SEX (EEX)2/N EE(X2) E(EX)2