Inferential Statistics and Distributions 13–5
8250FC~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:39 PM Printed: 10/27/05 2:57
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
µµ
µ, and 6.35 is σ
σσ
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
ound. 1å99 is the upper bound. The normal
curve is defined by a mean
µ
µµ
µ of 165.1 and a
standard deviation
σ
σσ
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.
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