Texas Instruments TI-83 Manual Book page 242

To obtain a more precise bound on the population mean
increase the sample size to 90. Use a sample mean
standard deviation
(introduction; page 13.2). This time, use the
option.
7. Press ... |
stat editor for
Press ~ Í to select
editor 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 of 6.35 cm., what height
m
is exceeded 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
of 7.1 calculated from the larger random sample
Sx
to display the inferential
8
.
TInterval
Inpt:Stats
Í to store 163.8 to
8
.
n
] to display the
þ
(summary statistics) input
Stats
. The
þ .
.
Sx
,
Calculate
DISTR
m of women's heights,
of 163.8 and sample