which survey is most likely affected by bias?...
which survey is most likely affected by bias?\n○ a survey of teenagers about their favorite colors\n○ a survey of students about vacation policies in a school district\n○ a survey of supermarket shoppers about products they would like to see added\n○ a survey of bike riders on whether they wear helmets
Answer
# Brief Explanations:
In the survey of bike - riders on whether they wear helmets, respondents may be inclined to give a socially desirable answer (claim they wear helmets even if they don't) due to safety norms and expectations. In the other surveys, there is less incentive for such biased responses. For example, favorite colors are personal preferences, vacation policies in a school district are a matter of opinion without a strong social pressure to lie, and supermarket shoppers' product suggestions are also just personal desires.
# Answer:
a survey of bike riders on whether they wear helmets