Statistics: Margin Of Error

Question

If n=19, ¯x(x-bar)=36, and s=9, find the margin of error at a 99% confidence level

Give your answer to two decimal places.

Answer 1

First, find the critical value: 2.89

Next, find the standard error of the mean: 3*(sqrt(19))/19= .69

Finally, the margin of error is 2.89*.69 = 1.99

Answer: 1.99