单选题 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.

【正确答案】 A

【答案解析】[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。