11.Variance (²) measures

A. how spread each number in a data set is from the median.

B. how spread each number in a data set is from the mean and median.

C. how spread each number in a data set is from the mean.

D. none of the above.

According to The Central Limit Theorem, the sampling distribution of the sample mean is approximately normal if

A. all possible samples are selected.

B. the sample size is large.

C. the standard error of the sampling distribution is small.

D. none of the above.

A minimum ideal sample size n in The Central Limit Theorem should be

A. n>30.

B. n < 30.

C. n = 30.

D. None of the above.