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Which of the following four statistics the best estimator of

Question : Which of the following four statistics the best estimator of : 84347

Which of the following four statistics is the best estimator of the parameter = 4 and why? (you should provide TWO reasons)

Statistic A has a mean of 4 and a standard deviation of 14

Statistic B has a mean of 4 and a standard deviation of 16

Statistic C has a mean of 3 and a standard deviation of 14

Statistic D has a mean of 5 and a standard deviation of 12

now I would think it is either Statistic A since the mean of 4 is equal to the parameter of 4 or Statistic D because that has the smallest spread. I can't think of another reason though.

 

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