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January 30, 2015

January 30, 2015

Posted by **jim** on Saturday, April 20, 2013 at 12:10pm.

- statistics -
**MathGuru**, Monday, April 22, 2013 at 5:35pmYou will need a confidence interval formula for the difference of two population proportions.

Here is one such formula:

CI95 = (p1-p2) ± 1.96 [√(p1q1/n1 + p2q2/n2)]

Your data:

p1 = .62

q1 = 1 - p1 = .38

p2 = .24

q2 = 1 - p2 = .76

n1 = 150

n2 = 200

Substitute your data into the formula and calculate the confidence interval.

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