As a final model a data analyst fit a multiple linear regression model which includes quadratic and cubic term of youtube and facebook expenditures to predict sales. Outputs are given below. 00 sales. Im3 |tl) ## (Intercept) 2.545e-01 6.250e-01 0. 407 0. 684 ## youtube 1. 322e-01 1. 154e-02 11.454 > # # ## Residual standard error: 1.72 on 192 degrees of freedom ## Multiple R-squared: 0.9272, Adjusted R-squared: 0.9246 ## F-statistic: 349.4 on 7 and 192 DF, p-value: