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Find the number of degrees of? freedom

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Use the given information to find the number of degrees of? freedom, the critical values χ2L and χ2R?, and the confidence interval estimate of 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?% ?confidence; n=22?, s=0.25 mg.

Reference no: EM132858249

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