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1、If 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
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2、A common stock with a coefficient of variation of 0.50 has a (n):
A. Variance equal to half the stock’s expected return
B. Expected return equal to half the stock’s variance
C. Expected return equal to half the stock’s standard deviation
D. Standard deviation equal to half the stock’s 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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