"A new poll was just released showing the president's approval rating has dropped two points since he made his speech earlier this week. The polling company randomly surveyed 800 people, using a combination of landline direct contacts, cell-phone text invitations, and online contacts ." Which of the following is a VALID criticism of the poll analysis described above ? Such a poll would have a high enough margin of error that it would be hard to detect a real 2 point drop . This poll uses online polling, which is not scientific. This poll uses texting , which biases towards younger people 800 people is simply not a large enough sample to accurately summarize the beliefs of 330 million people.