Augusto wants to prove to his parents that watching TV while he does his homework will help him get better grades. He decides to ask 20 of his friends if they watch TV while they do their homework and what their grades are. He finds that his friends who have high grades also watch TV while they do their homework. He tells his parents that he has proven that watching TV while doing homework will cause his grades to improve. What mistake has Augusto made?

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Augusto wants to prove to his parents that watching TV while he does his homework will help him get better grades. He decides to ask 20 of his friends if they watch TV while they do their homework and what their grades are. He finds that his friends who have high grades also watch TV while they do their homework. He tells his parents that he has proven that watching TV while doing homework will cause his grades to improve. What mistake has Augusto made?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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The mistake he made was that he proved that his friends grade are better when they watch tv. Maybe the TV don't distract his friends as much
A. He did not use a random sample, and he tried to show cause and effect with an observational study. B. He did not use a random sample, and he tried to show cause and effect with an experiment. C. He did not separate his friends into different groups, and he didn't apply a treatment. D. He did not separate his friends into different groups, and he used a survey to collect data.
Ohhh okay makes sense, so it would be A then right? @zoomiemoo

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I would say maybe D. He did not separate his friends into different groups, and he used a survey to collect data.
@Vocaroo Unfortunately D. was incorrect :(
did all 20 of his friends have high grades? what were the grades without TV?

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