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A researcher wants to estimate, with 90% confidence, the percentage of dults who support abolishing penny. His estimate should be accurate in 3% of true proportion.

A) Find out the minimum sample size required, using a prior study which found that 34% of respondents said they support abolishing penny

b) No preliminary estimate is available. Find out the minimum sample size required.

a) Find out the minimum sample size required using prior study which found that 34% of the respondents said they support abolishing penny?

N= .........  

b) Find out the minimum sample size required supposing that no prior information is avaiable?

N=...........

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