SumSquares within = S(Scoreboys - meanboys)2 + S(Scoregirls-meangirls)2
= (5-7)2 + (7-7)2+(6-7)2+(8-7)2+(9-7)2+
(6-8)2+(9-8)2+(7-8)2+ (8-8)2+(10-8)2 = 20
Degrees of Freedomwithin =
(nboys - 1) + (xgirls - 1)
= 4 + 4 = 8
Variance within = SumSquareswithin / dfwithin = 20/8 = 2.5
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