This is coming from my professors study guide
A) 48 our of a random sample of 208 residents in NB township said they want a new park for a 90% confidence interval for the proportion of NB residents that want a new park
b) Suppose that prior to taking the sample you were told to find a 90% confidence interval for the proportion that want a park, and that it had to be +/- 3 points I.e +/- .03.prior to taking the sample you had no idea what the proportion p is how large of a sample would you need?