Level of nicotine in cigarettes
According to data from the Tobacco Institute Testing Laboratory, Camel Lights King Size cigarettes contain an average of 1.4 milligrams of nicotine. An advocacy group commissions an independent test to see if the mean nicotine content is higher than the industry laboratory claims.
(a) What are H0 and Ha?
(b) Suppose that the test statistic is z = 2.36. Is this result signi?cant at the 5% level?
(c) Is the result signi?cant at the 1% level?