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You are an IRS agent and wish to estimate, within 97% confidence, the proportion of tax payers who use an online tax service to file

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You are an IRS agent and wish to estimate, within 97% confidence, the proportion of tax payers who use an online tax service to file their taxes. Your estimate must be accurate to within 4% of the population proportion. Find the minimum sample size necessary if: 1. There is no preliminary estimate available. 2. A previous study indicated that 88% of tax payers said they used an online tax service to file their taxes

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