问题
单项选择题
When creating intervals around the mean to indicate the dispersion of outcomes, which of the following measures is the most useful The（）
A. variance.
B. median.
C. standard deviation.
答案
参考答案：C
解析：
The standard deviation is more useful than the variance because the standard deviation is in the same units as the mean. The median and mode do not help in creating intervals around the mean.