Check out the "What’s the Science" section at the beginning of this chapter, about logistic regression, and look at the concept graphic that represents patient treatment outcomes based on different drug doses for some imaginary drug.

a. Sketch the corresponding concept diagrams for the diabetes and the endangered species examples. For each example, invent a suitable predictor variable, label the axes appropriately, indicate what success and failure correspond to, specify what the blue dots signify, and what the red curve means. (You don’t need to specify a meaningful scale or units for the predictor variable: the idea is just to draw a concept diagram.)

b. Think of an example from your daily life where you could apply a logistic regression model. Formulate it as yes/no outcomes and a measurable predictor variable, sketch the corresponding concept diagram, and propose a purpose for the model.