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January 31, 2015

January 31, 2015

Posted by **D** on Friday, May 18, 2012 at 10:19pm.

- statistics -
**MathGuru**, Monday, May 21, 2012 at 8:45pmUse a proportional confidence interval formula:

CI95 = p + or - (1.96)(0.015)

...where p = x/n

Note: + or - 1.96 represents 95% confidence interval.

For p in your problem: 40/400 = .1

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

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