Steps |
Key Sequence |
Screens |
1. Enter data into list, L1 |
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2. Set up Stats Tests |
STAT |
![](GIFs/ci1.jpg) |
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twice |
![](GIFs/ci2.jpg) |
|
7 (for ZInterval...) |
![](GIFs/ci3.jpg) |
3. Select Data |
use left arrow key (if necessary) to move cursor to Data, then ENTER |
![](GIFs/ci3.jpg) |
4. Input standard deviation |
once, enter standard devation of POPULATION (if known, otherwise use
standard devation of sample), then ENTER |
![](GIFs/cid1.jpg) |
5. Select list, L1 |
(press ALPHA), then 2nd, then 1, then ENTER |
![](GIFs/cid2.jpg) |
6. Input confidence level |
once, enter confidence level (AS DECIMAL), then ENTER |
![](GIFs/cid3.jpg) |
7. Calculate CI |
ENTER |
![](GIFs/cid4.jpg) |
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. |