A sample of 12 cigarette brands is selected and the total nicotine contents (in %) in the sample are listed below: 16.0 10.5 11.4 11.0 10.7 11.3 17.8 13.9 13.4 12.6 13.2 15.4 Assume that the total nicotine contents are normal distributed and let u be the mean total nicotine content of all cigarette brands. (a) Find the best point estimate of μ and the maximum error associated with this estimate using 95% confidence level. (b) Construct a 90% confidence interval for μ and summarize it in words.

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