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A random sample of 100 employees at a company shows that 42 drive US made automobiles (the rest drive imported cars even though some are

A random sample of 100 employees at a company shows that 42 drive US made automobiles (the rest drive imported cars even though some are made in the USA). Form a 90% confidence interval for the proportion of all employees who drive US made cars. The interval is 0.42 what margin of error?

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