Graphical bonus question: Redo Exercise 8 without centering the variables

Graphical bonus question: Redo Exercise 8 without centering the variables. Use the results, in combination with the modelPredictions() function, to create prediction lines for PREP versus RTEN, with FAMI held constant at two different values—one stan? dard deviation above the mean and one standard deviation below the mean.

Exercise 8

Conduct a regression analysis of the linear and interactive effects of PREP and FAMI on RTEN using the lm() function. Interpret the results in your own words, making sure to report the outcomes of the significance tests.