Texas Instruments TI-83 Manual Book page 241

4. Press ... | to display the
menu, and then press † until
highlighted.
5. Press Í to select
inferential stat editor for
displayed. If
Data
press | Í to select
Press † and [
prompt (alpha-lock is on).
Press † † Ë
confidence level at the
6. Press † to move the cursor onto
and then press Í. The confidence
interval is calculated, and the
results are displayed on the home screen.
Interpret the results.
The first line,
(159.74,173.94)
the population mean is between about 159.74 cm. and 173.94 cm. This is about
a 14.2 cm. spread.
The .99 confidence level indicates that in a very large number of samples, we
expect 99 percent of the intervals calculated to contain the population mean.
The actual mean of the population sampled is 165.1 cm. (introduction; page
13.2), which is in the calculated interval.
The second line gives the mean height of the sample
interval. The third line gives the sample standard deviation
gives the sample size
STAT TESTS
8:TInterval
8:TInterval
TInterval
is not selected for
.
Data
] [ ] [ ] [ ] at the
H G H T
to enter a 99 percent
99
C.Level:
TInterval
, shows that the 99 percent confidence interval for
.
n
Inferential Statistics and Distributions 13-3
is
. The
is
,
Inpt:
List:
prompt.
,
Calculate
þ
used to compute this
. The bottom line
Sx