问题
单项选择题
Dispersion is defined as the variability around the central tendency and can be divided into absolute dispersion and relative dispersion. Which of the following is NOT described as a measure of relative dispersion（）
A. Range.
B. Sharlle ratio.
C. Coefficient of variation.
答案
参考答案：A
解析：
B项夏普比率和C项变化系数都是表达相对偏离程度，而A项间距是表达绝对偏离程度，即用最大值减去最小值。