SSbetween = nboys(meanboys- Grandmean)2 + ngirls(meangirls-Grandmean)2
5(7-7.5) 2 + 5(8-7.5) 2 = 1.25 + 1.25 = 2.50
Degrees of Freedom = (number of groups - 1) = 1
Variance between = 2.5/1= 2.5
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