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January 30, 2015

January 30, 2015

Posted by **smrey** on Wednesday, June 13, 2012 at 6:51pm.

- statistics -
**MathGuru**, Thursday, June 14, 2012 at 7:23pmExample of a proportional confidence interval formula:

CI95 = p ± (1.96)[√(pq/n)]

...where p = x/n, q = 1 - p, and n = sample size.

Note: ± 1.96 represents 95% confidence interval.

For p in your problem: 350/757 = .46

For q: 1 - p = 1 - .46 = .54

n = 757

I let you take it from here to calculate the interval.

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