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Use the given information to find the number of degrees of freedom, the critical values chi...

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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