单选题

Which of the following most accurately describes how to standardize a random variable X?

A、 Subtract the mean of X from X, and then divide that result by the standard deviation of X.
B、 Subtract the mean of X from X, and then divide that result by the standard deviation of the standard normal distribution.
C、 Divide X by the difference between the standard deviation of X and the standard deviation of the standard normal distribution.

【正确答案】 A

【答案解析】

A is correct. There are two steps in standardizing a random variable X: Subtract the mean of X from X, and then divide that result by the standard deviation of X.