. The file USmacrodata.xlsx contains U.S. quarterly GNP, Inflation rates, and Unemployment rates. Use this file to perform the following exercises:"

a. Develop a regression to predict quarterly GNP growth from the last four quarters of growth. Check for non-normality of residuals, heteroscedasticity, autocorrelation, and multicollinearity.

b. Develop a regression to predict quarterly inflation rate from the last four quarters of inflation. Check for non-normality of residuals, heteroscedasticity, autocorrelation, and multicollinearity.

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