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A researcher wishes to estimate, with 95% confidence, the population pro portion 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 is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 34% oi 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 that no prior information is available?
n = D (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 34% of the respondents said they are confident with their country’s banking
system? n = D (Round up to the nearest whole number as needed.) (-2]: How do the results from (a) and (b) compare? 0 A. Having an estimate of the population proportion reduces the minimum sample size needed.
0 B. Having an estimate of the population proportion has no eitect on the minimum sample size needed.
0 C. Having an estimate of the population proportion raises the minimum sample size needed.

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