Question: You wish to determine the best predictor of sales commission ($) among realtors based on number of years as a licensed realtor, average number of listings per month, and communication skills (based on a validated scale). What would be the appropriate statistical model? What would the resulting equation look like? What would be the optimum sample size to achieve power = .80 (assuming medium effect size and alpha = .05)? (Note: there is a figure in ch 5 that will help you with the latter)