Who carried out the first opinion poll and why are they so popular? This light-hearted and revealing clip examines the real purpose of polling voters and how you ensure the accuracy of a sample...
Opinion Polls in a Nutshell - for iPod/iPhone
Science
Who carried out the first opinion poll and why are they so popular? This light-hearted and revealing clip examines the real purpose of polling voters and how you ensure the accuracy of a sample...
