Texas Instruments TI-83 Manual Book page 269

tcdf(
2
c
pdf(
2
c
cdf(
computes the Student-t distribution probability
tcdf(
between lowerbound and upperbound for the specified df
(degrees of freedom), which must be > 0.
lowerbound
tcdf( ,
2
c
computes the probability density function (pdf) for
pdf(
the c 2
(chi-square) distribution at a specified x value. df
(degrees of freedom) must be an integer > 0. To plot the c
distribution, paste c
density function (pdf) is:
1
f x ( )
( df / 2 )
2
c
x df
pdf( , )
2
computes the c
c
cdf(
between lowerbound and upperbound for the specified df
(degrees of freedom), which must be an integer > 0.
2
c lowerbound
cdf(
Inferential Statistics and Distributions 13-31
upperbound df
, )
2
to the
pdf(
Y=
df / 2 df / 2
(1/2) x
Note: For this example,
Xmin = 0
Xmax = 30
Ymin = L.02
Ymax = .132
2
(chi-square) distribution probability
upperbound df
, , )
editor. The probability
1 x / 2
e , x 0
2