Using the three---year return percentage variable in Retirement Funds: a. Construct a table that computes the mean for each combination of market cap, risk and star rating. b. Construct a table that computes the standard deviation for each combination of market cap, risk and star rating. c. What conclusions can you reach concerning differences based on market cap (small, mid---cap, and large), risk (low, average and high) and the star rating (one, two, three, four, and five)?