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X1, X2,...Xn are iid random variables from a U(0,b) distribution. Which estimator is an unbiased estimator...

X1, X2,...Xn are iid random variables from a U(0,b) distribution. Which estimator is an unbiased estimator for b?

2 X bar n
X bar n
1/n (X1squared + X2squared +....Xnsquared)
1/n2(X1squared + X2squared +....Xnsquared)
Math   Statistics-And-Probability   
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