# TI-BASIC:Invt

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Command Summary

Calculates the inverse of the cumulative [*https://en.wikipedia.org/wiki/Student%27s_t-distribution Student's t-distribution] function with degrees of freedom ν.

Command Syntax

invT(probability, ν)

Press:

1. 2ND DISTR to access the distribution menu
2. 4 to select invT(, or use arrows.

TI-84+/SE (OS 2.30 or greater)

2 bytes

invT( is the inverse of the cumulative Student t distribution function: given a probability p and a specified degrees of freedom ν, it will return the number x such that tcdf(-E99,x,ν) is equal to p

:invT(.95,24
1.710882023


${\displaystyle \definecolor {darkgreen}{rgb}{0.90,0.91,0.859}\pagecolor {darkgreen}\operatorname {invT} (p,1)=\tan \left(\pi \left(p-{\frac {1}{2}}\right)\right)}$