Using the three-year return percentage variable in Retirement Funds
a. Construct a table that computes the mean for each type, risk, and rating.
b. Construct a table that computes the standard deviation for each type, risk, and rating.
c. What conclusions can you reach concerning differences among the types of retirement funds (growth and value), based on the risk (low, average, and high) and the rating (one, two, three, four, and five)?