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.

c. Develop a regression to predict quarterly unemployment rate from the unemployment rates of the last four quarters. Check for non-normality