A model summary of the same model (4c) is given below. What conclusion can you draw from these results? Coefficients: Residual standard error: 6.198 on 503 degrees of freedom Multiple R-squared: 0.5476, Adjusted R-squared: 0.5458 F-statistic: 304.4 on 2 and 503 DF, p-value: <2.2e−16