# TI-BASIC:Fcdf

Command Summary

Calculates the F-distribution probability betwen lower and upper for specified numerator and denominator degrees of freedom.

Command Syntax

Fcdf(lower, upper, numerator df, denominator df

Press:

1. 2ND DISTR to access the distribution menu
2. 9 to select Fcdf(, or use arrows.

Press 0 instead of 9 on a TI-84+/SE with OS 2.30 or higher.

TI-83/84/+/SE

2 bytes

Fcdf( is the F-distribution cumulative density function. If some random variable follows this distribution, you can use this command to find the probability that this variable will fall in the interval you supply.

The arguments lower and upper express the interval you're interested in. The arguments numerator df and denominator df, often written d,,1,, and d,,2,,, specify the F-distribution, written as F(d,,1,,,d,,2,,).

${\displaystyle \definecolor {darkgreen}{rgb}{0.90,0.91,0.859}\pagecolor {darkgreen}\operatorname {Fcdf} (a,b,d_{1},d_{2})=\int _{a}^{b}\operatorname {Fpdf} (x,d_{1},d_{2})\,dx}$