A tobacco company claims that its best-selling cigarettes contain less than 40mg of nicotine. This claim is tested at the 1% significance level by using the results of 15 randomly selected cigarettes....

A tobacco company claims that its best-selling cigarettes contain less than 40mg of nicotine. This claim is tested at the 1% significance level by using the results of 15 randomly selected cigarettes. The mean is 42.6 mg and the standard deviation is 3.7mg. Evidence suggests that nicotine is normally distributed. Is there enough evidence from this study to support the claim of the tobacco company?