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January 30, 2015

January 30, 2015

Posted by **kathy** on Monday, July 30, 2012 at 9:31am.

- statistics -
**MathGuru**, Monday, July 30, 2012 at 5:22pmFormula using 99% confidence interval:

CI99 = mean ± [(2.58)(sd/√n)]

Note: Within the brackets is the margin of error.

Your data:

mean = 5.15

sd = 1.68

n = 4400

Plug the values into the formula and calculate.

I hope this will help get you started.

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