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How to Construct a Confidence Interval

Confidence Level df t critical value 90% 15 1.75 98% 7 3.00 95% 23 2.07 Same as z critical value information on the left. b. Compute the confidence interval based on formula in step 2 . NOTE: Calculator shortcuts for the confidence interval: When σ known: Z-Interval When σ unknown: T-Interval 1-PropZInt ...

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