You are a researcher at Whole Foods Market. Over the course of your tenure there, you have noticed that people's purchase behavior seems to be influenced by their method of payment (that is, how they pay at the register for their purchasecash versus credit card). You especially have noticed that method of payment may have an influence on the healthfulness of the products people buy. That is, method of payment influences the extent to which people by healthy versus unhealthy food products. You define a healthy food product as something that is good for people's health. You decide to design an experiment to test whether method of payment indeed influences the extent to which people by healthy products. You also decide to test whether the effect of payment method on purchase of healthy versus unhealthy products depends on gender (that is, differ by gender).

1. Describe the IV(s) and DV(s) that will be part of your experiment. Make sure you describe how you manipulate/measure everything
2. Outline one potential extraneous variable and explain how you could use (a) statistical control, and (b) design control to account for this influence.
3. Outline the results you expect. That is, describe main and interaction effects