A manufacturer of tortilla chips is launching a blue chip made with blue corn.They reached an agreement with a local grocery chain to allow them to use different displays for the new chips in 4 of the chain's stores.The sales (bags) in the stores were tracked for 6 weeks, one store was closed for a week because of a fire caused by their red-hot salsa.We assume that all 4 stores serve similarly sized markets and their weekly sales of other products are similar.