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September 23, 2014

September 23, 2014

Posted by **Joe** on Wednesday, September 30, 2009 at 8:37pm.

- statistics -
**MathGuru**, Thursday, October 1, 2009 at 10:44amCI95 = mean + or - 1.96(sd divided by √n)

...where + or - 1.96 represents the 95% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.

For the 99% confidence interval, you will have to substitute the value from a z-table that corresponds to 99%.

Put the values you are given from the problem into the formula and go from there to determine your confidence intervals.

I hope this will help get you started.

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