A researcher wishes to? estimate, with 95?% ?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 is available. Find the minimumsample size needed.
n=
?(b) Find the minimum sample size? needed, using a prior studythat found that 22?%
of the respondents said they are confident with their? country'sbanking system.
n=
?(c) Compare the results from parts ?(a) and choose one
A.Having an estimate of the population proportion has no effecton the minimum sample size needed.
B.Having an estimate of the population proportion reduces theminimum sample size needed.
C.Having an estimate of the population proportion raises theminimum sample size needed.
