题目
What can be said about a distribution that has fatter tails than a normal distribution (given the same variance)?
选项
A.It has a positive kurtosis.
B.It has a negative kurtosis.
C.It has a positive skewness.
D.It has a negative skewness.
答案
A
解析
A normal distribution has a kurtosis coefficient equal to positive three. Anything greater than three indicates a distribution with fatter tails. 正态分布的峰度系数等于正三。 大于3的值表示尾部更肥。