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April 17, 2014

Homework Help: math help

Posted by tracy10 on Monday, June 24, 2013 at 3:06pm.

Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)

Sample Number Mean Std. Dev.
1 27 39 21
2 16 26 35

Lower Limit Incorrect: Your answer is incorrect. .
Upper Limit Incorrect: Your answer is incorrect. .

This is what I have got so far. (27-1)X21squared + (16-1) X35squared divided by 27+16-2=12160.55556 then I sqrt 1/27 + 1/16=.3154949081, then 39-26/? x.315494981 now I am stuck???

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