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 percent of shoppers use coupons. Does the sampling method the store manager used support a valid inference?
The sampling method the store manager used does not support a valid inference because he only surveyed shoppers in the meat aisle. This may not be representative of all shoppers in the store, as coupon usage may vary among different aisles or types of products. To draw a valid inference about the percentage of shoppers who use coupons, the manager would need to survey a random sample of shoppers throughout the store.
