Use the given information to find the number of degrees offreedom, the critical values chi subscript upper l superscript 2χ2l and chi subscript upper r superscript 2χ2r, and the confidence interval estimate of sigmaσ. it is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. nicotine in menthol cigarettes 99%confidence; n = 26, s = 0.29 mg.

df = (type a whole number.)

χ2l = (round to three decimal places as needed.)

χ2r = (round to three decimal places as needed.)

the confidence interval estimate of σ is __ mg < σ < __ mg. (round to two decimal places as needed.)