k Assignment Chapter 11 Saved Exercise 11-9 Algo A research analyst is examining a stock for possible inclusion in his client's portfolio. Over a 9-year period, the sample mean and the sample standard deviation of annual returns on the stock were 23% and 14%, respectively. The client wants to know if the risk, as measured by the standard deviation, differs from 20%. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Construct the 90% confidence intervals for the population variance and the population standard deviation. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.) Confidence Intervals Population variance to Population standard deviation to