Use the given information to find the number of degrees of freedom, the critical values chi Subscript Upper L Superscript 2 χ2L and chi Subscript Upper R Superscript 2 χ2R , and the confidence interval estimate of sigma σ. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 95 95 % confidence; n equals = 25 25 , s equals = 0.28 0.28 mg.
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