Suppose that insurance companies did a survey. They randomly surveyed 400 drivers and found that 310 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up. Construct a 95% confidence interval for the population proportion who claim they always buckle up. State the confidence interval. (Round your answers to four decimal places.) a. b. Calculate the error bound. (Round your answer to four decimal places.)

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