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Derive or explain the source of the finite df CDF equation.
For the life of me I can not figure out, nor can I find any sources for, how the CDF function arises when the degrees of freedom are finite, and k=2. It is not obvious, but the function's output DOES match table values. For the infinite df case, the derivations are obvious, replace f and F with the standard normal functions and integrate. this is not the case with finite df. Does f get replaced with t and F with T, or do we use a ratio of t and to estimate S, the standard deviation?Beakerboy (talk) 14:01, 30 September 2016 (UTC)[reply]
