A well-known supermarket in the U.S. wants to determine what percent of storegoers are vegetarian. They randomly survey 5 people every hour at one of their grocery stores for a day. What type of bias exists in this survey?

Question

A well-known supermarket in the U.S. wants to determine what percent of storegoers are vegetarian. They randomly survey 5 people every hour at one of their grocery stores for a day. What type of bias exists in this survey?

Option #1: Volunteer Response Bias
Option #2: Selection Bias
Option #3: Question Bias

Answer 1

Option #2: Selection Bias

This survey suffers from selection bias because it only looks at a specific group of people (those who happen to be in the supermarket during that particular hour) and does not account for those who may be vegetarian but are not present at that time. This can lead to an inaccurate representation of the overall percentage of storegoers who are vegetarian.