Supermaket ahoppen were observed and questioned immedakby aher pulting an teem in their cart of a randomi samplo of 260 dhooting a product at the regilar price, 187 dimed to the diference between the two poputaton progortions shopers chooping a produat at a specax proe who dam ta chock tre price before putsing in into their cart. The 99ik oorfidenco interal is (Pound to two decimal plasts as neeged).