A store manager wants to know the percentage of shopper to use coupons. He’s surveys everyone who enters the mail. He finds that 60% of shoppers use coupons. Does the sampling method the store manager you support a valid inference?

Answer 1

It is important to consider that surveying only the people who enter the store may not be a representative sample of all shoppers. The sampling method used would likely result in a biased estimate of the percentage of shoppers who use coupons. To make a valid inference about the percentage of all shoppers who use coupons, the store manager should consider surveying a random sample of shoppers, regardless of whether they enter the store or not.