Texas Instruments TI-83 Manual Book page 268

normalcdf(
invNorm(
tpdf(
13-30 Inferential Statistics and Distributions
computes the normal distribution probability
normalcdf(
between lowerbound and upperbound for the specified
mean m and standard deviation s . The defaults are m =0
and s =1.
lowerbound
normalcdf(
computes the inverse cumulative normal
invNorm(
distribution function for a given area under the normal
distribution curve specified by mean m and standard
deviation s . It calculates the x value associated with an
area to the left of the x value. 0  area  1 must be true.
The defaults are m =0 and s =1.
m
area[
invNorm( , ,
computes the probability density function (pdf) for
tpdf(
the Student-t distribution at a specified x value. df (degrees
of freedom) must be >0. To plot the Student-t distribution,
paste to the
tpdf(
function (pdf) is:
[( df 1 2
f x ( )
( df / 2
x df
tpdf( , )
upperbound[
,
s ]
)
editor. The probability density
Y=
2
) ] / ( 1 x df / )
)
Note: For this example,
Xmin = L4.5
Xmax = 4.5
Ymin = 0
Ymax = .4
m s ]
, , )
( df 1 2 ) /
df