Question: Let X1, . . ., Xn be a random sample from a population with the mean m. What condition must be imposed on the constants

Let X1, . . ., Xn be a random sample from a population with the mean m. What condition must be imposed on the constants c1, c2, . . ., cn so that
X1 +C2X2+.+

is an unbiased estimator of μ?

X1 +C2X2+.+

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