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?

A. Question Bias
B. Selection Bias
C. Volunteer Response Bias

Answer 1

B. Selection Bias

This survey may suffer from selection bias because they are only surveying people who happen to be in the store at that specific hour. Vegetarians who shop at different times may not be represented in the survey results, leading to an inaccurate estimation of the percentage of vegetarians among storegoers.