Mary and Nick Stalcheck have an investment portfolio containing four vehicles. It was developed to provide them with a balance between current income and capital appreciation. Rather than acquire mutual fund shares or diversify within a given class of investment vehicle, they developed their portfolio with the idea of diversifying across various types of vehicles. The portfolio currently contains common stock, industrial bonds, mutual fund shares, and options. They acquired each of these vehicles during the past three years, and they plan to invest in other vehicles sometime in the future. Currently, the Stalchecks are interested in measuring the return on their investment and assessing how well they have done relative to the market. They hope that the return earned over the past calendar year is in excess of what they would have earned by investing in a portfolio consisting of the S&P 500 stocks composite index. Their research has indicated that the risk-free rate was 7.2% and that the (before-tax) return on the S&P 500 portfolio was 10.1% during the past year. With the aid of a friend, they have planned to ignore taxes, because they feel their earning have been adequately sheltered. Because they did not make any portfolio transactions during the past year all of the Stalcheck