Which of the following statements is true?
A)	is biased, but is an unbiased estimator of .
B)	is unbiased, but is a biased estimator of .
C)	Both and are unbiased estimators of .
D)	Both and are biased estimators of .
Answer:C
Which of the following statements is true?
A)	is biased, but is an unbiased estimator of . B)	is unbiased, but is a biased estimator of . C)	Both and are unbiased estimators of . D)	Both and are biased estimators of .