twice
once then ENTER
once, enter standard devation of POPULATION (if known, otherwise use
standard devation of sample), then ENTER
| Steps | Key Sequence | Screens |
| 1. Set up Stats Tests | STAT | |
| twice |
|
|
| 7 (for ZInterval...) | |
|
| 2. Select Input | once then ENTER |
|
| 3. Input standard deviation | once, enter standard devation of POPULATION (if known, otherwise use
standard devation of sample), then ENTER |
|
| 4. Input mean of SAMPLE | enter mean of SAMPLE, then ENTER | |
| 5. Input sample size | enter sample size, then ENTER | |
| 6. Input confidence level | enter confidence level (AS DECIMAL), then ENTER | |
| 7. Calculate CI | ENTER | |
| In this case the 90% CI is 3.0101 to 3.3899. | ||