Texas Instruments TI-82 STATS

Inferential Statistics and Distributions 13–29
8250FC~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:39 PM Printed: 10/27/05 2:57
PM Page 29 of 36
To display the DISTR menu, press y [DISTR].
DISTR DRAW
1: normalpdf(
N
ormal probability density
2: normalcdf(
N
ormal distribution probability
3: invNorm( Inverse cumulative normal distribution
4: tpdf( Student-t probability density
5: tcdf( Student-t distribution probability
6: c
2
pdf( Chi-square probability density
7: c
2
cdf Chi-square distribution probability
8: Üpdf( Û probability density
9: Ücdf( Û distribution probability
0: binompdf( Binomial probability
A: binomcdf( Binomial cumulative density
B: poissonpdf( Poisson probability
C: poissoncdf( Poisson cumulative density
D: geometpdf( Geometric probability
E: geometcdf( Geometric cumulative density
Note: L1å99 and 1å99 specify infinity. If you want to view the area left
of upperbound, for example, specify lowerbound=L1å99.
norwmalpdf( computes the probability density function (pdf) for
the normal distribution at a specified x value. The defaults are
mean
m =0 and standard deviation s =1. To plot the normal
distribution, paste
normalpdf( to the Y= editor. The probability
density function (pdf) is:
fx e
x
()=>
−
−
1
2
0
2
2
2
πσ
σ
µ
σ
()
,
normalpdf(x[,m,s])
Note: For this example,
Xmin = 28
Xmax = 42
Ymin = 0
Ymax = .25
Tip: For plotting the normal distribution, you can set window variables
Xmin and Xmax so that the mean m falls between them, and then
select 0:ZoomFit from the ZOOM menu.
Distribution Functions
DISTR menu
normalpdf(