2 2 cr tical values Use the given information to find the number of degrees of freedom the and R and the confidence interval estimate of o It is XR reasonable to assume that a simple random sample has been selected from a population with a normal distribution Nicotine in menthol cigarettes 90 confidence n 27 s 0 26 mg Click the icon to view the table of Chi Square critical values df 26 Type a whole number XL Round to three decimal places as needed