Texas Instruments TI-82 STATS

Inferential Statistics and Distributions 13–35
8250FC~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:39 PM Printed: 10/27/05 2:57
PM Page 35 of 36
To display the DISTR DRAW menu, press y [DISTR] ~.
DISTR DRAW instructions draw various types of density
functions, shade the area specified by lowerbound and
upperbound, and display the computed area value.
To clear the drawings, select
1:ClrDraw from the DRAW menu
(Chapter 8).
Note: Before you execute a DISTR DRAW instruction, you must set
the window variables so that the desired distribution fits the screen.
DISTR DRA
W
1: ShadeNorm( Shades normal distribution.
2: Shade_t( Shades Student-
t
distribution.
3: Shadec
2
( Shades c
2
distribution.
4: ShadeÛ
ÛÛ
Û( Shades Û distribution.
Note: L1å99 and 1å99 specify infinity. If you want to view the area left
of upperbound, for example, specify lowerbound=L1å99.
ShadeNorm( draws the normal density function specified by
mean
m and standard deviation s and shades the area between
lowerbound and upperbound. The defaults are
m =0 and s =1.
ShadeNorm(lowerbound,upperbound[,m,s])
Note: For this example,
Xmin = 55
Xmax = 72
Ymin = L.05
Ymax = .2
Distribution Shading
DISTR DRAW
Menu
ShadeNorm(