d) Create a plot that shows the relationship between fluoride content and caries experience in the new data. Add the least squares regression line to the scatterplot. e) Based on the plot from part d), comment on whether the model assumptions of linearity and constant variability seem reasonable for these data. f) Use a residual plot to assess the model assumptions of linearity and constant variability. Comment on whether the residual plot reveals any information that was not evident from the plot from part e)