单选题 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.

【正确答案】 C

【答案解析】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.