Let x1 x2 x3 and x4 be a random sample of observations from
Let X1, X2, X3, and X4 be a random sample of observations from a population with mean μ and variance σ2. Consider the following estimator of μ: 1 = 0.6 X1 + 0.4 X2 + 0.25 X3 + 0.45 X4. What is the variance of 1?
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