An unbiased estimator is:
a. any sample statistic used to approximate a population parameter.
b. a sample statistic, which has an expected value equal to the value of the population parameter.
c. a sample statistic, which is usually less than the population parameter.
d. represented by a sample mean, the sample proportion, the sample variance, and the sample standard deviation.
e. any standard error of the mean or standard error of the proportion.
B
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