Posted by **Samuel** on Tuesday, November 30, 2010 at 2:26pm.

Can someone tell me what formula I should use?

The number of milligrams of tar in filtered and unfiltered cigarettes is being compared. The following cigarettes are pulled to be part of the samples:

Filtered: bunch of data

Unfiltered: bunch of data

The first question is create a confidence interval of the difference between the two types of cigarettes.

Thanks

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