Supermarkets are interested in strategies to increase temporarily the unit sales of a product. In one study, researchers compared the effect of display type and price on unit sales for a particular product. The following display types and pricing schemes were employed.

Display types: normal display space interior to an aisle, normal display space at end of an aisle, and enlarged display space.

Pricing schemes: regular price, reduced price, and cost.

Identify the (a) experimental units, (b) response variable, (c) factors, (d) levels of each factor, and (e) treatments