Use the given information to find the number of degrees of freedom, the critical values x and ya . and the confidence interval estimate of a. 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 = 26, s = 0.22 mg. Click the icon to view the table of Chi-Square critical values. of =(Type a whole number.)