A simple random sample of 25 filtered 100 mm cigarettes is obtained, and the tar content of each cigarette is measured. The sample has a mean of 13.2 mg and a standard deviation of 3.7 mg. Use a 0.05 significance level to test the claim that mean tar content of filtered 100 mm cigarettes is less than 21.1 mg, which is the mean for the unfiltered king size cigarettes. What do the results suggest about the defectiveness of the filters?

Question

A simple random sample of 25 filtered 100 mm cigarettes is obtained, and the tar content of each cigarette is measured. The sample has a mean of 13.2 mg and a standard deviation of 3.7 mg. Use a 0.05 significance level to test the claim that mean tar content of filtered 100 mm cigarettes is less than 21.1 mg, which is the mean for the unfiltered king size cigarettes. What do  the results suggest about the defectiveness of the filters?

anonymous · Answer

i think you shoul use area for this