If $X _ { 1 } , X _ { 2 } , \ldots \ldots , X _ { n }$

Short Answer

If $X _ { 1 } , X _ { 2 } , \ldots \ldots , X _ { n }$ is a random sample from a normal distribution, and the sample size n is small, then the standardized variable $T = ( \bar { X } - \mu ) / ( S / \sqrt { n } )$ has a __________ distribution with __________ degrees of freedom.