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with explain everything : If X1 and X2 constitute a random sample of size 2 from...

with explain everything :
If X1 and X2 constitute a random sample of size 2 from an exponential population, find the
efficiency of Y1 relative to XBAR, where Y1 is the first order statistic and 2Y1 and XBAR are both unbiased estimators of θ

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