a researcher wishes to estimate the percentage of adults who support abolishing the penny what size sample should be obtained if he wishes the estimate to be within 4 percentage points with 95% confidence if he uses a previous estimate of 24% he does not use ant prior estimates

A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 4 percentage points with 95% confidence if (a) he uses a previous estimate of 24%? (b) he does not use any prior estimates? Click here to view the standard normal distribution table image ? Click here to view the standard normal distribution table (page 2) (a) n= (Round up to the nearest integer.) (b) n=(Round up to the nearest integer.)