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A researcher wishes to estimate, with 95% confidence, the population proportion of adults who are confident...
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who are confident with their country's banking system. His estimate must be accurate within 4% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 28% of the respondents said they are confident with their country's banking system. (c) Compare the results from parts (a) and (b).
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