单选题
Which of the following statements is true regarding the Student's t-distribution, as the degrees of freedom become larger: A. Confidence intervals based on the Student's t-distribution become larger. B. Sample sizes of the Student's t-distribution become smaller. C. The Student t-distribution approaches a standard normal distribution.
【正确答案】
C
【答案解析】When compared to the normal distribution, the t-distribution is flatter with more area under the tails.