A lab did a test on filtered and unfiltered cigarettes to determine the amount of tar and nicotine for each ...

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A lab did a test on filtered and unfiltered cigarettes to determine the amount of tar and nicotine for each. The data obtained are in the ...

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n1 = 20 n2 = 15 x1-bar = 21.2 x2-bar = 22.5 ...
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