Ann Conducts a Study,and Finds That the Estimated Population Variances

Multiple Choice

Ann conducts a study,and finds that the estimated population variances for the groups are 12.8,16.3,15.1,and 19.9.What is the within-groups estimate of the population variance?

A) (12.8² + 16.3² + 15.1² + 19.9²) / (4 - 1) = 351.18.
B) (12.8² + 16.3² + 15.1² + 19.9²) / 4 = 263.39.
C) (12.8 + 16.3 + 15.1 + 19.9) / (4 - 1) = 21.37.
D) (12.8 + 16.3 + 15.1 + 19.9) / 4 = 16.03.