Texas Instruments TI-82 STATS Manual Book page 270

Distribution Functions
Ü Ü Ü Ü pdf(
Ü Ü Ü Ü cdf(
13–32 Inferential Statistics and Distributions
(continued)
computes the probability density function (pdf) for the Û
Ü Ü Ü Ü pdf(
distribution at a specified x value. numerator df (degrees of
freedom) and denominator df must be integers > 0. To plot the Û
Ü Ü Ü Ü pdf(
distribution, paste
density function (pdf) is:
[( n d ) / 2
f x ( )
( n / 2 ) ( d /
where
Ü Ü Ü Ü pdf(
x numerator df
,
computes the Û distribution probability between
Ü Ü Ü Ü cdf(
lowerbound and upperbound for the specified numerator df
(degrees of freedom) and denominator df. numerator df and
denominator df must be integers >0.
Ü Ü Ü Ü cdf(
lowerbound upperbound
,
denominator df
to the editor. The probability
Y=
 
] n n / 2
n / 2 1
  x
 
2 ) d
n = numerator degrees of freedom
d = denominator degrees of freedom
denominator df
, )
Note: For this example,
Xmin = 0
Xmax = 5
Ymin = 0
Ymax = 1
numerator df
,
)
( n d ) / 2
( 1 n x d / )
,
, x 0