Which of the following must be true for an estimator of a population parameter to be unbiased? А
The sampling distribution of the estimator is normal.
B
The expected value of the estimator is equal to the population parameter.
с
The sampling distribution of the estimator is the same shape as the distribution of
the population parameter.
D
The variability of the sampling distribution of the estimator is equal to the variability
of the population parameter.
E
The variability of the sampling distribution of the estimator is less than the variability
of the population parameter.