Assignment:
Suppose that it is a presidential election year and Ohio is one of the 'swing' states. Your polling company wants to conduct a presidential preference poll of the citizens of Ohio to predict which candidate will win the election.
a. How many voters must be polled to be 95% confident of your results within +/- 3%?
b. How many voters must be polled to be 95% confident of your results within +/- 2%?
c. How many voters must be polled to be 95% confident of your results within +/- 1%?
d. Discuss the effect of margin of error on sample size.
Provide complete and step by step solution for the question and show calculations and use formulas.