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The National Center for Education Statistics reported that 47% of college students work to pay for tuition and living expenses. Assume that a sample of 450 college students was used in the study.

a. Provide a 95% confidence interval for the population proportion of college students who work to pay for tuition and living expenses.

b. Provide a 99% confidence interval for the population proportion of college students who work to for tuition and living expenses.

c. What happens to the margin of error as the confidence is increased for 95% to 99%?

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