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Use the given information to find the number of degrees of freedom, the critical values X2L and X2R, and the confidence interval estimate of standard
Use the given information to find the number of degrees of freedom, the critical values X2L and X2R, and the confidence interval estimate of standard deviation. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.
Nicotine in menthol cigarettes 80% confidence; n=29, s=0.29 mg.
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