S&P 500 is a stock market index based on the market capitalization of 500 large companies in the U.S. Go to the FRED Economic Data website(Links to an external site.) for S&P 500 and download the data for just one year.You may choose any one-year window.

1. Using R, Describe the plot.
2. Using R, the dataset to linear regression and moving average models. Which model do you think is a better predictive model?Explain why.
3. Discuss how you can improve the prediction.