A reseacher wishes to estimate with 95% confidence, the percentage of adults who support abolsihing the penny. His estimate must…

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 minimu 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.