A store manager wants to know the percentage of shoppers who use coupons he surveys everyone who enters the meat aisle. He finds that 60% of shoppers use coupons does the sampling method. The store managers used support a valid inference no because not all people who enter me I’ll use coupons yes, because the sample contains coupon users and non-users. Yes because the everyone who entered the aisle know because the sample is not chosen randomly.
