The file stockreturnsindex contains nine years of returns for Apple (AAPL), American Medical Devices (AMD), Oracle Corporation (ORCL), and the Information Technology S&P Index. Construct a portfolio from AAPL, AMD, and ORCL that matches the return of the Information Technology S&P index as closely as possible. Hint: Minimize the sum of the squared differences between the portfolio return and the return of the Information Technology S&P Index.