A supermarket wants to see the effects of coupons on spending. They believe that male and female heads of households will respond differently to the coupons. The supermarket chooses 200 males and 200 females, and sends half of each group the coupon, while half receive nothing. The outcome measure is expenditures in the following week.

a) What type of experimental design is this?

b) What are the factors?

c) What is the response variable?

d) Does this experiment satisfy the principles needed for a well-designed experiment?