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At issue is the proportion of people in a particular county who do not have health care insurance coverage and an investigator wants to estimate

At issue is the proportion of people in a particular county who do not have health care insurance coverage and an investigator wants to estimate it with 90% confidence. A preliminary sample of 230 people were asked if they have insurance coverage and 75 replied that they did not have coverage. What sample size would be needed to achieve a margin of error of .03

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