A random sample of 14 cigarettes of a certain brand has an average nicotine content of 3.8 milligrams and a standard deviation of 2 milligrams. What is the upper bound of the 99% confidence interval for the average nicotine content of the cigarettes.
The critical value for and degrees of freedom is
The corresponding confidence interval is computed as shown below:
The upper bound of the 99% confidence interval for the average nicotine content of the cigarettes is 5.410 milligrams.
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