Posted by **nick** on Tuesday, August 12, 2008 at 9:41pm.

Nicotine (mg) Filtered Kings

Nonfiltered Kings

n1 = 21

n2 = 8

sample mean = 0.94

sample mean = 1.65

s = 0.31

s = 0.16

Suppose you were to conduct a test (at the 0.05 significance level) to test the claim that king-size cigarettes with filters have a lower mean amount of nicotine than the mean amount of nicotine in non-filtered king-size cigarettes.

For this test, the critical value (to 3 decimal places) is

and the test statisic (to 2 decimal places) is .

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