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Independent random samples of size 1 = 20 and 2 = 15 are drawn from two normal populations with equal unknown variance 2 . The

Independent random samples of size 1 = 20 and 2 = 15 are drawn from two normal populations with equal unknown variance 2 . The respective sample standard deviations are 1 = 3.0 and 2 = 2.8. The estimate of the common population variance 2 is

(A) 2.900 (B) 8.508 (C) 5.800 (D) 8.410 (E) 2.915

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