A storm manager wants to know the percentage of shoppers who use coupons. He surveys everyone who enters the meat aisle. He finds that 60% of the shoppers use coupons. This is simply method the store manager used support a valid inference?

Answer 1

No, the store manager surveyed only shoppers who entered the meat aisle, which may not be representative of all shoppers in the store. The percentage of shoppers using coupons in the meat aisle may be different from the percentage in other aisles or overall in the store. To make a valid inference about the percentage of shoppers who use coupons, the store manager should survey a more diverse group of shoppers.