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Consider the following statements concerning Student's t distribution: A. The variance of the t distribution decreases...

Consider the following statements concerning Student's t distribution: A. The variance of the t distribution decreases as the degrees of freedom decrease. B. The t statistic follows a t distribution, when the sample size is small, provided the random variable used to construct the t statistic follows a normal distribution C. In practice, the t distribution can be used to determine the critical value for a confidence interval estimate for the population mean when the population variance is unknown provided the sample size is sufficiently large and the distribution of the underlying population is not highly skewed.

only B is true

only C is true

only A and B are true

only B and C are true

A, B and C are true
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