Business Finance 2023 A Researcher

2023 A researcher wishes to estimate with 9595 confidence the population proportion of adults who are


A researcher wishes to​ estimate, with 9595​% ​confidence, the population proportion of adults who are confident with their​ country’s banking system. His estimate must be accurate within 22​% 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 3636​% 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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