Margin of error = 0.01; confidence level = 95%; educated guess = 0.3 a. Obtain a sample

Question:

Margin of error = 0.01; confidence level = 95%; educated guess = 0.3
a. Obtain a sample size that will ensure a margin of error of at most the one specified (provided of course that the observed value of the sample proportion is further from 0.5 than the educated guess).
b. Compare your answer to the corresponding one from Exercises 12.31-12.36 and explain the reason for the difference, if any.