Question

An environmental expert is interested in modeling the concentration of various chemicals in well water over time. For this exercise you need to define appropriate variables and state the population model for each scenario. Part (a) is done as an example. (a) Predict the amount of sulfide in several different wells based on its distance from a mining site and the number of years the well has been monitored. Y the sulfide concentration in the ith well. Xmiles,i-the distance between the ith well and mining site. Xyearsj -the number of years the ith well has been monitored. (b) Predict the amount of lead in several different wells based on how far the well is from a mining site (c) Predict the amount of lead in several different wells based on how far the well is from a mining site (d) Predict the amount of lead in several different wells based on how far the well is from a mining where є¡ is independent and normally distributed with zero mean and standard deviation, ơ with different intercepts depending on whether or not the well has been cleaned. with different lines depending on whether or not the we has been cleaned. site with different slopes, but the same intercept, depending on whether or not the well has been cleaned.

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