NO.PZ2019040801000011
问题如下:
A distribution that has a smaller percentage of small deviations from the mean and a smaller percentage of extremely large deviations from the mean:
选项:
A.is positively skewed.
B.is a symmetric distribution.
C.has negative excess kurtosis.
D.has positive excess kurtosis.
解释:
C is correct
考点:Skewness and Kurtosis
解析:当一个分布的mean附近位置的比例比较高,离mean很多标准差的位置分布比例也比较高,也就是尖峰肥尾的时候,峰度会比较高;反之(本题的情况)峰度会比较低。
是否可以通过画图解释?