Determine the minimum sample size needed using prior study

Reference no: EM13471254

A reseacher wishes to estimate with 95% confidence, the percentage of adults who support abolsihing the penny. His estimate must be accurate within 5% of the true porportion.

a) Find the minimum sample size needed, using prior study that found theat 24% of the residents said they support the penny

b) No preliminary estimate is availiable , find the minuim sample size needed.

Reference no: EM13471254

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