'1. An environmental expert is interested in modeling the concentration of various chemicals in well water over time. egression population models that would be used to (just write out the population models): a. Predict the amount arsenic (Arseni c) in a well based on Year , the distance ( Miles ) from a mining site, and theinteraction of two variables (use this model for the rest of the parts unless otherwise explicitly told another model to use). b. Predict the auJ0unt of lead (Lead) in a well based on Year with two different lines depending on whether or not the well has been cleaned (Iclean). c. Predictjtbeamount of titanium (Titanium) in a well based on a possible quadratic relationship with the distance (Milts) from a mining site. d. Predict the amount of sulfide (Sulfide) in a well based on Year, distance (Miles) from a mining site, deptha(Depth) of the well, and any interactions of pairs of explanatory variables.