48. Let X1, X2, . . . , Xn be a random sample from a continuous distribution...

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48. Let X1, X2, . . . , Xn be a random sample from a continuous distribution with pdf f (x; u). For large n, the variance of the sample median is approximately 1/{4n[ f( ; u)]2}. If X1, X2, . . . , Xn is a random sample from the normal distribution with known standard deviation s and unknown m, determine the ef ciency of the sample median

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