In 1990, Business Week magazine compiled financial data on the 1,000 companies that had the biggest impact on the U.S. economy. Data sampled from the top 500 companies in Business Week's report are presented in the following table. In addition to the company name, four variables are shown:
1990 rank: Based on company's market value (share price on March 16, 1990, multiplied by available common shares outstanding)
1989 rank: Rank in 1989 compilation
P-E ratio: Price-to-earnings ratio, based on 1989 earnings and March 16, 1990, share price
Yield: Annual dividend rate as a percentage of March 16, 1990, share Price

Answer the following questions about these data.
a. What is the estimated least-squares equation for the regression of yield (Y) on 1989 rank (X2) and P-E ratio (X3)?
b. Using your answer to part (a), give a point estimate for the yield for a company that had a 1989 ranking of 200 and a P-E ratio of 10.
c. Find the R2-value for the regression in part (a), and comment on the fit of the model.