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The sample had to be a ''valid'' representation of the population, which means that each person in the target population has a known chance of being sampled.<ref> In unweighted samples, each person has an equal chance. If people have a known but unequal chance, they are weighted to make the chances appear equal.</ref> Unscientific public opinion polls, made by collecting information from a haphazard sample, date from the '''straw polls''' in American elections in the 1820s. As soon as modern statistical sampling theory was invented around 1930, [[George Gallup]] and other advertisers started created nationwide public opinion polls, using about 1500 cases. The American public became fascinated with polls and they spread to many democratic countries by 1940. Totalitarian countries did not allow them.
The sample had to be a ''valid'' representation of the population, which means that each person in the target population has a known chance of being sampled.<ref> In unweighted samples, each person has an equal chance. If people have a known but unequal chance, they are weighted to make the chances appear equal.</ref> Unscientific public opinion polls, made by collecting information from a haphazard sample, date from the '''straw polls''' in American elections in the 1820s. As soon as modern statistical sampling theory was invented around 1930, [[George Gallup]] and other advertisers started created nationwide public opinion polls, using about 1500 cases. The American public became fascinated with polls and they spread to many democratic countries by 1940. Totalitarian countries did not allow them.
==History of Polling==American elections in the 1820s. As soon as modern statistical sampling theory was invented around 1930, [[George Gallup]] and other advertisers started created nationwide public opinion polls, using about 1500 cases. The American public became fascinated with polls and they spread to many democratic countries by 1940. Totalitarian countries did not allow them.
==History of Polling==American elections in the 1820s. As soon as modern statistical sampling theory was invented around 1930, [[George Gallup]] and other advertisers started created nationwide public opinion polls, using about 1500 cases. The American public became fascinated with polls and they spread to many democratic countries by 1940. Totalitarian countries did not allow them.
==History of Polling==American elections in the 1820s. As soon as modern statistical sampling theory was invented around 1930, [[George Gallup]] and other advertisers started created nationwide public opinion polls, using about 1500 cases. The American public became fascinated with polls and they spread to many democratic countries by 1940. Totalitarian countries did not allow them.
==History of Polling==American elections in the 1820s. As soon as modern statistical sampling theory was invented around 1930, [[George Gallup]] and other advertisers started created nationwide public opinion polls, using about 1500 cases. The American public became fascinated with polls and they spread to many democratic countries by 1940. Totalitarian countries did not allow them.
==History of Polling==
==History of Polling==