9.1 Suppose X1, X2, X3 denotes a random sample from the exponential distribution with density function x> 0 re ailgmea od T.E. (x) = 0 elsewhere e-irto) be 2691 Consider the following four estimators...

Suppose X₁,  X₂, X₃
denote a random sample from the exponential distribution with density function.

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Extracted text: 9.1 Suppose X1, X2, X3 denotes a random sample from the exponential distribution with density function x> 0 re ailgmea od T.E. (x) = 0 elsewhere e-irto) be 2691 Consider the following four estimators of 0: oldigilgarô, = X, tib ziô, X1 + X2 sl 101 %3D X, + 2X2 Ôg = 3 Ôg = X a Which of the above estimators are unbiased for 0? b Among the unbiased estimators of 0, which has the smallest variance? 1seM 2.