Aliо immigrаted tо the United Stаtes 4 yeаrs agо with her family. She is a first year graduate student studying individual opinions of governance. Unfortunately, Alio put off her research until she went home to visit her family over Thanksgiving break. Knowing most people in the neighborhood, the town, her church, etc., Alio thought she could quickly come up with at least 100 survey participants if we went from door to door, and approached people during her weekly activities. Upon reading Alio's research paper, the professor immediately recognized a problem with the data. Alio was marked down for failing to account for _____________________.