For the following problem, use the given information to find the number of degrees of freedom, the critical values y't and y's, and the confidence interval estimate of o. You may assume that a simple random sample has been selected from a population with a normal distribution. Keep your numerical answers rounded to 3 decimal places. For a sample of pulse rates in a population of patients in a locality: 90% confidence; n = 66, s = 8 beats, X = 83 beats. A. DF = B. 71 = 90% CI estimate of o = Lower Limit: Upper Limit