SOLUTION: In order to estimate the average age of onset of a certain type of disease a researcher collects a sample of 15 people with the disease and produces the following 95% confidence in

Question 1181286: In order to estimate the average age of onset of a certain type of disease a researcher collects a sample of 15 people with the disease and produces the following 95% confidence interval (83.9219, 90.6782). Find a 99% confidence interval for the average age based on the same data set
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
The sample mean is the average of the endpoints of the C.I., thus .
Now from the initial given,
===> ==> s = 6.1.
Then the new 99% C.I. will be = (82.6112, 91.9888).

The t-probabilities were gotten from https://stattrek.com/online-calculator/t-distribution.aspx.
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