When we're asked to analyse data in paragraph 2, the method suggest than we plot boxplots and scatter plots of response vs. each covariate.
But basically box plots and scatterplots are the same when plotting response versus weight or horsepower as every car's got a different value for these variables. On the contrary, if we want to analyse response vs type of transmission, box plots are usefull.
Do we have to choose between scatter and box plots ? Do we need to tell the relevance of each variables or only the ones that we think they're relevant ?