Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 224

2. Press † Ë
163 8
Ë Í to store 7.1 to
Press
7 1
Í to store 90 to
Press
90
3. Press † to move the cursor onto
then press Í to calculate the new 99 percent
confidence interval. The results are displayed on
the home screen.
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)?
4. Press ' to clear the home screen.
Press y = to display the
(distributions) menu.
5. Press to open the
3
information as follows:
Press Ë †
95 165
area, 165.1 is m, and 6.35 is s).
6. Press Í to paste the function and Í again
to calculate the result.
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.
7. Press p and set the window variables to
these values.
Xmin=145 Ymin=
Xmax=185 Ymax=.08
Xscl=5 Yscl=0
Í to store 163.8 to v.
.
Sx
.
n
Calculate
DISTR
wizard. Enter the
invNorm(
Ë † Ë † (95 is the
1 6 35
L .02 Xres=1
Chapter 13: Inferential Statistics and Distributions
, and
217