Managers of a national retail chain want to test a new advertising program intended to increase the total sales in each store. The new advertising requires moving some display items and making changes...

Managers of a national retail chain want to test a new advertising program intended to increase the total sales in each store. The new advertising requires moving some display items and making changes in lighting and decoration. The changes can be done overnight in a store. How would you recommend they choose the stores in which to place the advertising? Would data from stores that did not get the new advertising be useful as well?