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What would be the approximate margin of error if the

Question: Suppose that a researcher is designing a survey to estimate the proportion of adults in your state who oppose a proposed law that requires all automobile passengers to wear a seat belt.

a. What would be the approximate margin of error if the researcher randomly sampled 400 adults?

b. What sample size would be needed to provide a margin of error of about 2%?

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Basic Statistics: What would be the approximate margin of error if the

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