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October 20, 2014

October 20, 2014

Posted by **molebogeng** on Thursday, April 12, 2012 at 4:01am.

- statistics -
**MathGuru**, Friday, April 13, 2012 at 7:55pmYou will need to use a two-sample confidence interval formula.

Here is one example:

CI95 = (x1 − x2) ± z-value × √(s1^2/n1 + s2^2/n2)

(Note: × means to multiply)

x1 = mean A

x2 = mean B

z-value = 1.96

s1^2 = standard deviation A (squared)

s2^2 = standard deviation B (squared)

n1 = sample size A

n2 = sample size B

Plug the values into the formula and calculate the interval.

I hope this will help get you started.

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