Use the given information to find the number of degrees of? freedom, the critical values chi Subscript Upper L Superscript 2χ2L and chi Subscript Upper R Superscript 2χ2R?, 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 98?%
?confidence; nequals=24?,
sequals=0.22 mg.