30. Consumer Confidence An increase in the rate of consumer savings is frequently tied to a lack...

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30. Consumer Confidence An increase in the rate of consumer savings is frequently tied to a lack of confidence in the economy. A random sample of n5200 savings accounts in a local community showed a mean increase in savings account values of 7.2%

over the past 12 months, with a standard deviation of 5.6%. Estimate the mean percent increase in savings account values over the past 12 months for depositors in the community. Find the margin of error for your estimate.

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