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The Difference Between the Obama and McCain Voting Percentage

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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.

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Solution Summary

This solution calculates the difference between the Obama and McCain voting percentage based on a pool of 1600 voters.

Solution Preview

Proportion
Obama 0.5625
Mccain 0.375
Difference ...

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