Use the regression line to predict the `Sales` amount when `newspaper` budget is `$136.18K`. Comment on the difference between the output and the expected value.

```{r}

#INSERT YOUR ANSWER HERE

```

d) Use `newspaper` and `facebook` variables to build a linear regression model to predict `sales`. Display a summary of your model indicating Residuals, Coefficients, ..., etc. What conclusion can you draw from this summary?