Use the given information to find the number degrees of freedom, critical values X 2/L and X 2/R and the confidence interval estimate of lower case sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Platelet count in women 98% confidence; n=21, s=65.5 mg. Please show the break down of how to solve this type of problem along with calculator routine, if has one.