Friday, August 7, 2009 – Estimating the Validity of a Poll

Have you ever seen a poll of 900 people and the results are supposed to represent how 4 000 000 people in British Columbia feel. How accurate is this poll? And if they say, “this poll is accurate to within 3.3% of the actual answer, 19 times out of 20″, what does that mean, and how did they get the 3.3%? Read the answer to this by clicking on the file name below to see the pdf file.