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January 27, 2015

January 27, 2015

Posted by **Sally** on Monday, August 15, 2011 at 11:00pm.

- statistics -
**MathGuru**, Tuesday, August 16, 2011 at 10:36amFormula:

CI90 = mean + or - 1.645(sd/√n)

sd = standard deviation

n = sample size

Substitute the values from your problem into the formula and calculate.

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