Question: Refer to the table below showing nicotine content of randomly selected filtered and non-filtered king-size cigarettes.

a. Use a 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.

b. Do cigarette filters appear to be effective in reducing nicotine?

Nicotine (mg)

Filtered Kings Non?Filtered Kings

n1 = 21 n2 = 8

x1 = 0.94 x2 = 1.65

s1 = 0.31 s2 = 0.16