Use the given information to find the number of degrees of freedom, the critical values x² and X, 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 80% confidence; n = 20, s = 0.23 mg. Click the icon to view the table of Chi-Square critical values. df = 19 (Type a whole number.) x² = = 11.651 (Round to three decimal places as needed.) X²/2 = 27.204 (Round to three decimal places as needed.) The confidence interval estimate of o is 0.04 mg

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