The recent B.C. provincial election which delivered a shocking Liberal party victory of 50 seats(44.5% of vote) and a fourth consecutive term to just 33 seats 39.5 % of the vote) for the New Democrats should send pollsters back to their books. The turn out was extremely low just 53 % and the Greens did better than expected taking 8% of the vote and a key seat on Vancouver Island but the fact is that virtually no pollster had predicted anything like this outcome. Instead relying for the most part on on line sampling from a sample that resembles the provincial demographic they concluded that the New Democrats were on their way to a majority government. The polls were wrong. Vote splitting and a low turnout undoubtedly were factors. The combined NDP and Green vote exceeded the Liberal vote in some 12 ridings that the Liberals won. Complacency about the need to turn out and vote may have been a factor. But it should be clear now that polls that rely on on line sampling have a much larger possibility of error than those that sample the whole population in a statistically sound way. All polls have a margin of error 19 times out of 20. In the remaining case they are simply dead wrong. Journalists, pundits and politicians often misunderstand statistics and probability. B.C. was no exception .
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