| Steps |
Key Sequence |
Screens |
| 1. Enter data into list, L1 |
|
|
| 2. Set up Stats Tests |
STAT |
 |
| |
 twice |
 |
| |
7 (for ZInterval...) |
 |
| 3. Select Data |
use left arrow key (if necessary) to move cursor to Data, then ENTER |
|
| 4. Input standard deviation |
 once, enter standard devation of POPULATION (if known, otherwise use
standard devation of sample), then ENTER |
 |
| 5. Select list, L1 |
(press ALPHA), then 2nd, then 1, then ENTER |
 |
| 6. Input confidence level |
once, enter confidence level (AS DECIMAL), then ENTER |
 |
| 7. Calculate CI |
ENTER |
 |
| In this case the 95% CI is 223.97 to 224.0019; the mean of the sample is 224.0019; the
standard deviation of the sample is 0.0618 and the sample size is 16. |