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.

Question

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The within-groups estimate of the population variance is calculated by taking the average of the variances, which is done by summing the variances and dividing by the number of groups.

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