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1If no other estimator of a given parameter has a sampling distribution with a smaller variance, the estimator used is best characterized as

??A. accurate

??B. efficient

??C. unbiased

??D. consistent

Anewser B.

?An unbiased estimator is efficient if no other unbiased estimator of the same parameter has a sampling distribution with smaller variance


2、A common stock with a coefficient of variation of 0.50 has a (n):

??A. Variance equal to half the stocks expected return

??B. Expected return equal to half the stocks variance

??C. Expected return equal to half the stocks standard deviation

??D. Standard deviation equal to half the stocks expected return

Answer: D

The coefficient of variation is a measure of relative dispersion that indicates how much dispersion exists relative to the mean of the distribution the coefficient of variation is the standard deviation divided by the mean

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