Use the given information to find the number of degrees of freedom, the critical values x and x, and the confidence interval estimate of . 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 = 24, s = 0.22 mg. Click the icon to view the table of Chi-Square critical values. df = (Type a whole number.) x2 = (Round to three decimal places as needed.) x = (Round to three decimal places as needed.) The confidence interval estimate of is mg < < (Round to two decimal places as needed.) mg.