Calculator User Manual

Chapter 13: Inferential Statistics and Distributions 334
If the height distribution among a population of women is normally distributed with a
mean m of 165.1 centimeters and a standard deviation s of 6.35 centimeters, what height
is exceeded by only 5 percent of the women (the 95th percentile)?
The result is displayed on the home screen; it shows that five percent of the women are
taller than 175.5 centimeters.
Now graph and shade the top 5 percent of the population.
10. Press ‘ to clear the home screen.
Press y = to display the
DISTR
(distributions) menu.
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 m, and 6.35 is s.
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