Answer:
Step-by-step explanation:
Arguably, all of them are at least somewhat biased, but the most biased would be <span>surveying people 15 to 20 years old leaving a concert </span> because being at a concert would be highly correlated with liking the type of music played at that concert.
Answer:
I'd love to help but we need more details
Step-by-step explanation:
I'll edit my answer to solve if you can give more information about the problem, we don't know the context and what to solve