Steps |
Key Sequence |
Screens |
1. Set up Stats Tests |
STAT |
![](GIFs/ci1.jpg) |
|
twice |
![](GIFs/ci2.jpg) |
|
ALPHA, then APPS (for 2–PropZInt...) |
![](GIFs/2szpci1.jpg) |
2. Input number of successes for SAMPLE1, x1 |
enter value for x1, then ENTER |
![](GIFs/2szpci2.jpg) |
3. Input number of observations in SAMPLE1, n1 |
enter value for n1, then ENTER |
![](GIFs/2szpci3.jpg) |
4. Input number of successes for SAMPLE2, x2 |
enter value for x2, then ENTER |
![](GIFs/2szpci4.jpg) |
5. Input number of observations in SAMPLE2, n2 |
enter value for n2, then ENTER |
![](GIFs/2szpci5.jpg) |
6. Input confidence level |
enter confidence level (AS DECIMAL), then ENTER |
![](GIFs/2szpci6.jpg) |
7. Calculate confidence interval |
ENTER |
![](GIFs/2szpci7.jpg) |
In this case, the 99% CI is from –0.016 to 0.39672;
1 is 0.8033;
2 is 0.6129; n1 is 61
and n2 is 62. |