Question 7 A sample of 12 cigarettes contained an average of 43 milligrams of nicotine. If the sample standard deviation was s = 2.8 milligrams, then find the 99% confidence interval for the mean amount (in milligrams) of nicotine in the sampled brand of cigarettes. A 41.1 to 44.9 C 41.3 to 44.7 B 40.2 to 45.8 D 40.4 to 45.6