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  3. a researcher wishes to? estimate, with 90?% ?confi

A researcher wishes to? estimate, with 90?% ?confidence, the population proportion of adults who are confident...

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Basic Math

A researcher wishes to? estimate, with 90?% ?confidence, thepopulation proportion of adults who are confident with their?country's banking system. His estimate must be accurate within 5?%of the population proportion. ?(a) No preliminary estimate isavailable. Find the minimum sample size needed. ?(b) Find theminimum sample size? needed, using a prior study that found that25?% of the respondents said they are confident with their?country's banking system. ?(c) Compare the results from parts ?(a)and ?(b). ?(a) What is the minimum sample size needed assuming thatno prior information is? available?

Answer & Explanation Solved by verified expert
4.4 Ratings (898 Votes)
Solution Given thatmargin of error E 5 005At 90 confidence level the z    See Answer
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