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.

Question

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.

A. Yes because the sample contains coupon users an non-users
B. No, because not all people who enter the meat aisle use coupons
C. No, because the sample is not chosen randomly
D. Yes, because the manger asked everyone who entered the meat aisle

Answer 1

C. No, because the sample is not chosen randomly

The sampling method used by the store manager does not support a valid inference because it only includes shoppers who entered the meat aisle, not a random sample of all shoppers in the store. This could lead to a bias in the results as it may not be representative of all shoppers.