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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
fx()
1
Γ df 2⁄()
--------------------
1/2()
df/2
x
df 21–⁄
e
x/2–
x 0≥,=