单项选择题
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.
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单项选择题
The sum of the deviations may be 0.00.To get around this problem，we use the（）of the deviations
A.square
B.absolute value
C.minimum
D.maximum -
单项选择题
deviation is the distance between a（）and the（）.（）
A.median；mean
B.data point；mean
C.quartile；median
D.data point；median -
单项选择题
A theorem that allows us to use thenormal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the（）
A.approximation theorem
B.normal probability theorem
C.central limit theorem
D.central normality theorem
