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A researcher wishes to estimate, with 9595 % confidence, the population proportion of adults who are confident with their country's banking system.
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 2626%
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 that no prior information is available?
nequals=nothing
(Round up to the nearest whole number as needed.)
(b)
What is the minimum sample size needed using a prior study that found that 2626%
of the respondents said they are confident with their country's banking system?
nequals=nothing
(Round up to the nearest whole number as needed.)
