Lakes Data (Appendix C.1). As in Chapter 8 Project 4, your goal is to model the relationship between summer-time chlorophyll (CHL) with levels of the nutrients nitrogen (TN) and phosphorus (TP)....

Lakes Data (Appendix C.1). As in Chapter 8 Project 4, your goal is to model the relationship between summer-time chlorophyll (CHL) with levels of the nutrients nitrogen (TN) and phosphorus (TP). Instead of treating TN and TP as quantitative variables, try categorizing them into low or high levels, based on their medians (this is called a median split). To further explore any relation, try splitting TN and TP into four categories using the quartiles. Your data will be unbalanced.