In a new poll where people were asked on whether or not they will vote for a presidential candidate: 1600 people were picked randomly from a population that amounts to about 80 million eligible voters.
The results were as follow:
N Obama Mccain Undecided
1600 900 600 100
Estimate the difference between the Obama and McCain voting percentage.
This solution calculates the difference between the Obama and McCain voting percentage based on a pool of 1600 voters.