A company wishes to analyze a box of cigars. At random, 8 cigars are taken, which have an average of 2.6 milligrams of nicotine, which have a variance of 0.81. Considering a normal distribution, construct a 95% confidence interval for the true mean nicotine content. a) (2.04 : 3.16) b) (1.98 ; 3.22) c) (1.85 : 3.35) d) (2.30 ; 2.90) e) None of the above