2. You must determine how exactly yahoo.com calculates historical beta, then replicate their calculations. This requires the use of regression software (or functions in Excel, if you know how to do that). Note, you must calculate returns first. Is the data sorted correctly in time order? If not, you must sort your stock prices and market prices so that the oldest prices are first, then calculate returns. Answer the following questions: a. How, exactly, does yahoocom calculate their beta? How many months of return data do they use? How many months of price data do you need? How do you know that you and Yahoo used the same data period