Texas Instruments TI-82 STATS Manual Book page 242

Getting Started: Mean Height of a Population
To obtain a more precise bound on the population mean
increase the sample size to 90. Use a sample mean
deviation of 7.1 calculated from the larger random sample (introduction; page
Sx
13.2). This time, use the
7. Press ... |
8
editor for
TInterval
Press ~ Í to select
changes so that you can enter summary
statistics as input.
8. Press † Ë
163
Ë Í to store 7.1 to
Press
7 1
Í to store 90 to
Press
90
9. Press † to move the cursor onto
and 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 of 165.1 cm. and a standard deviation
m
by only 5 percent of the women (the 95th percentile)?
10. Press ' to clear the home screen.
Press y [
DISTR
(distributions) menu.
13–4 Inferential Statistics and Distributions
(summary statistics) input option.
Stats
to display the inferential stat
.
. The editor
Inpt:Stats
Í to store 163.8 to
8
Sx
.
n
Calculate
] to display the
DISTR
of women's heights,
m
þ þ þ þ
of 163.8 and sample standard
þ þ þ þ
.
.
,
of 6.35 cm., what height is exceeded
(cont.)