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   When X1, X2, ..., and Xn are probability samples from a population whose probability density...

   When X1, X2, ..., and Xn are probability samples from a population whose probability density functions are f(x) = 3x^2 / θ^3, 0 < x < θ.
   a. Determine constant c so that cx̅ becomes the unbiased estimator of θ
b. Find 95% confidence interval of θ.

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