I need help with a and b the questions for both are stated after the question .

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 99% confidence if (a) he uses a previous estimate of 34%? (b) he does not use any prior estimates? Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). ests (a) n= (Round up to the nearest integer.) tivity content Enter your answer in the answer box and then click Check