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TI-83 Plus Inferential Statistics and Distributions 427
tpdf(
tpdf(
computes the probability density function (pdf) for the Student-
t
distribution at a specified
x
value.
df
(degrees of freedom) must be >0. To
plot the Student-
t
distribution, paste
tpdf(
to the
Y=
editor. The probability
density function (pdf)
is:
df
dfx
df
df
xf
df
π
2/)1(
2
)/1(
)2/(
]2/)1[(
)(
+−
+
Γ
+Γ
=
tpdf(
x
,
df
)
Note: For this example,
Xmin =
L
4.5
Xmax = 4.5
Ymin = 0
Ymax = .4
tcdf(
tcdf(
computes the Student-
t
distribution probability between
lowerbound
and
upperbound
for the specified
df
(degrees of freedom), which must be
> 0.
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