题目
The correlation coefficient for two dependent random variables is equal to:
选项
A.the product of the standard deviations for the two random variables divided by the covariance.
B.the covariance between the random variables divided by the product of the variances.
C.the absolute value of the difference between the means of the two variables divided by the product of the variances.
D.the covariance between the random variables divided by the product of the standard deviations.
答案
D
解析
Correlation coefficient is equal to the covariance between the random variables divided by the product of the standard deviations.相关系数等于随机变量之间的协方差除以标准偏差的乘积。