Based on survey data, the Literary Digest erroneously predicted that Alf Landon would beat Franklin D.Roosevelt in the upcoming presidential election.What cardinal rule of survey methods did the Literary Digest violate? Make sure

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The cardinal rule of survey methods that the Literary Digest violated is to ensure that the sample is a random sample from the population. They relied on voluntary responses from magazine subscribers and car owners who were not representative of the entire population. Therefore, their sample was biased and not random.

Based on Survey Data, the Literary Digest Erroneously Predicted That