The file P07_39.xlsx contains historical monthly returns for 28 companies. For each company, calculate the estimated mean return and the estimated variance of return. Then calculate the estimated...

The file P07_39.xlsx contains historical monthly returns for 28 companies. For each company, calculate the estimated mean return and the estimated variance of return. Then calculate the estimated correlations between the companies’ returns. Note that “return” here means monthly return. (Hint: Make life easy for yourself by using StatTools’ Summary Statistics capabilities.)