问题
单项选择题
Which-of the following statements used to describe the Student’ s t-distribution is least accurate The Student’s t-distribution:（）
A. Involves two random variables.
B. Is symmetric around its mean value of zero.
C. Has thinner tails than the normal distribution.
答案
参考答案：C
解析：
The Student’s t-distribution has fatter tails than the normal distribution, or for a high number of degrees of freedom, has tails that resembles the normal distribution.