Texas Instruments TI-84 - Manual (Page 380)

Chapter 13: Inferential Statistics and Distributions 377
c
2
pdf( pdf( pdf( pdf(
c
2
pdf( computes the probability density function ( pdf ) for the c
2
(chi-square) distribution
at a specified x value. df (degrees of freedom) must be an integer > 0. To plot the c
2
distribution, paste c
2
pdf( to the Y= editor. The probability density function ( pdf ) is:
c
2
pdf(x,df)
Note: For this example,
Xmin = 0
Xmax = 30
Ymin =
L
.02
Ymax = .132
f x
( )
1
Γ df 2 ⁄ ( )
-------------------- 1/2
( ) df/2
x
df 2 1 –
⁄
e
x/2 –
x 0
≥
, =