Use the given information to find the number of degrees of freedom, the critical values and x, and the confidence interval estimate of o. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 95% confidence; n = 21, s= 0.22 mg. Click the icon to view the table of Chi-Square critical values. df = x = x² = The confidence interval estimate of o is (Round to two decimal places as needed.) (Type a whole number.) (Round to three decimal places as needed.) (Round to three decimal places as needed.) mg

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