What is the minimum sample size needed using a prior study

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A researcher wishes estimate, with 95% confidence the population portion of adults who are confident with our countries banking system. His estimate must be accurate within 2% of the population proportion. What is the minimum sample size needed? What is the minimum sample size needed using a prior study that found 28% of the respondents said they are confident with the countries banking system?

Reference no: EM131760620

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