题目内容：
The reason that we prefer the sample standard deviation as our measure of typical variation instead of the sample variance is that （）
A. the variance is not as accurate a measurement as the standard deviation
B.the standard deviation has been corrected for bias while the variance has not
C.the standard deviation is in the same units as the data values.
D.the variance is in the same units as the data values.
参考答案：