A researcher collects data by interview on a sample of households to find out if people who read ‘quality’ daily newspapers are more knowledgeable about politics than people who read ‘tabloid’ newspapers daily. The hunch was confirmed. People who read the quality newspapers were twice as likely to respond accurately to a series of questions designed to test their political knowledge. The researcher concludes that the quality dailies induce higher levels of political knowledge than the tabloids. Assess this reasoning.

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