The Swit Diamonds Company has six retail outlets in the Northeast Region. The company is considering the introduction of ATM cards in those stores where the average cash or check purchase exceeds $350.00. Using samples of customer purchase receipts, the manager estimates the following confidence intervals for six different stores:

Randolph$318.56$422.78

Yonkas$381.63$517.91

Cambridge$418.31$674.22

Bayridge$309.78$517.67

Newport$385.96$544.58

Boston$338.56$512.09

How many and which stores should the use of ATM cards be introduced?.

Four stores should introduce the ATM card including Byridge, Boston and New Port and Boston

Three stores should introduce the ATM card including Randolph, New Port and Cambridge

Three stores should introduce the ATM including Yonkas, Cambridge and New Port

Four stores should introduce the ATM including Yonkas, Cambride, Boston and New Port