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How do TV channels determine viewing figures? watch

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    (Original post by Rucklo)
    How can you know this when you don't track the whole country?
    There exist formulae for working out the margin of error given the sample size and other such information.
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    Those that don't believe the figures represent the UK population should read a book on statistics. Within the stated margin of error they are perfectly representative, as Secretmessages has said.
 
 
 
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