What Are We Assuming?
This chapter introduces several techniques that we can use when we have a continuous response variable and one or more categorical (or ordinal) factors. As a very simple example, we might consider an experiment in which subjects are asked to complete a simple crossword puzzle, and our response variable is the amount of time required to complete the puzzle. We randomly divide the subjects into three groups. One group completes the puzzle while rock music plays loudly in the room. The second group completes the puzzle with the recorded sound of a large truck engine idling outside the window. The third group completes the puzzle in a relatively quiet room.
Our question might be this: does the mean completion time depend on ...
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