Question: A researcher reasons that people who read broadsheet newspapers are likely to be more knowledgeable about personal finance than readers of tabloid newspapers. He interviews 100 people about the newspapers they read and their level of financial knowledge. Sixty-five people read tabloids and thirty-five read broadsheets. He finds that the broadsheet readers are on average considerably more knowledgeable about personal finance than tabloid readers. He concludes that reading broadsheets enhances levels of knowledge of personal finance. Assess his reasoning.