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January 30, 2015

January 30, 2015

Posted by **Lynn** on Wednesday, June 13, 2012 at 8:38pm.

- statistics -
**MathGuru**, Thursday, June 14, 2012 at 7:16pmUse a confidence interval formula:

CI90 = mean ± 1.645(sd/√n)

...where ± 1.645 represents the 90% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.

Plug your data into the formula to calculate the confidence interval and the margin of error.

I hope this will help get you started.

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