Describe a hypothetical study in which principal components or factor analysis would be useful either for theory development (e.g., trying to decide how many different dimensions are needed to describe personality traits) or for data reduction (e.g., trying to decide how many different latent variables might be needed to understand what is measured in a multiple-item survey of "patient satisfaction with medical care"). List the variables, describe the analyses that you would run, and describe what pattern of results you expect to see.