As a Manufacturer of Guitars,a Major Corporation Wants to Estimate

Short Answer

As a manufacturer of guitars,a major corporation wants to estimate the proportion of guitar players who are right-handed.How many golfers must be surveyed if they want to be within 0.02,with a 95% confidence?
a.Assume that there is no prior information that could be used as an estimate of
.
b.Assume that the manufacturer has an estimate of
found from a previous study,which suggests that 75% of guitar players are right-handed.