Inferential Statistics and Distributions 13-5
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 5 of 36
11.Press 3 to paste invNorm( to the home
screen.
Press Ë 95 ¢ 165 Ë 1 ¢ 6 Ë 35 ¤
Í.
.95 is the area, 165.1 is µ, and 6.35 is σ.
The result is displayed on the home screen; it shows that five percent of the
women are taller than 175.5 cm.
Now graph and shade the top 5 percent of the population.
12.Press p and set the window
variables to these values.
Xmin=145 Ymin=L.02 Xres=1
Xmax=185 Ymax=.08
Xscl=5 Yscl=0
13.Press y [DISTR] ~ to display the DISTR
DRAW menu.
14.Press Í to paste ShadeNorm( to the
home screen.
Press y [ANS] ¢ 1 y [EE] 99 ¢ 165 Ë 1
¢ 6 Ë 35 ¤.
Ans (175.5448205 from step 11) is the
lower bound. 1å99 is the upper bound. The
normal curve is defined by a mean µ of
165.1 and a standard deviation σ of 6.35.
15.Press Í to plot and shade the normal
curve.
Area is the area above the 95th percentile.
low is the lower bound. up is the upper
bound.