The below table shows the results of an OLS regression of US real GDP growth rates (REALGDP) on changes of oil prices (OIL), interest rate (INTERESTRATE) and inflation rates (INFLATION) (monthly data from 1990 to 2013): REALGDP = CONSTANT + a * OIL + b * INTERESTRATE + c * INFLATION Discuss the statistical significance of the parameters, interpret the sign and magnitude of the estimates, and overall fit of the model. Are the results in line with the predictions of the theory and why