C2pdf – Texas Instruments TI-84 User Manual
Page 380
Chapter 13: Inferential Statistics and Distributions
377
c
2
pdf(
pdf(
pdf(
pdf(
c
2
pdf(
computes the probability density function (
) 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 (
) 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
≥
,
=