Question

marco polled the 20 customers who had been going to a particular barbershop the longest. is this sample of the customers at the barbershop likely to be biased? yes no

Explanation:

A biased sample is one that doesn't represent the entire population fairly. Marco only polled the 20 customers who had been going to the barbershop the longest. This group is likely to have different opinions or characteristics (e.g., more loyal, familiar with the barbershop's history) compared to newer customers or the general customer population. So this sample is not random and is likely to be biased.

Answer:

yes