Steps | Key Sequence | Screens |
1. Set up Stats Tests | STAT | ![]() |
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8 (for TInterval...) | ![]() |
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2. Select Input | ![]() |
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3. Input mean of SAMPLE | ![]() |
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4. Input standard deviation | enter standard devation 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 95% CI is 18.687 to 70.193. |