题目
Positive-skewed distributions exhibit:
选项
A.a longer tail to the left of the distribution.
B.greater mass close to the expected value.
C.greater mass to the left of the expected value.
D.greater mass to the right of the expected value.
答案
C
解析
Positive-skewed distributions are those with a longer tail to the right side of the distribution, and the mass of left of the expected value is greater.正偏分布是指分布右侧尾部较长的分布，期望值左侧的质量较大。