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Let X N4((), V ) where fL .1 L .I Let 91 = X1 + X2 + X3 + X4 and 62 = X1 X2

Let X N4((), V ) where

\fL .1 L" .I Let 91 = X1 + X2 + X3 + X4 and 62 = X1 X2 X3 X4 be two estimators of 6. (1) Find the MSE of 61. (2) Find the MSE of 62. (3) Which estimator is better

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