A study has three groups, each with an equal number of participants. The population variance is estimated from the variance within each group, giving three estimates, 54.4, 48.6, and 50.9. What is the within-group estimate of the population variance?
A) (54.4 + 48.6 + 50.9)/(3?1) = 76.95
B) (54.4 + 48.6 + 50.9)/3 = 51.3
C) (54.4 + 48.6 + 50.9)/(3 + 1) = 38.48
D) (54.4 + 48.6 + 50.9)/(3 + 2) = 30.78
B
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