Example

9:00 PM Election Night on KSTAT-TV

• 2 Candidates for Governor (D & R)

• D has 51.17% of the 1st 10,000 votes

Is it safe to declare a winner?

se = sqrt(.51*.49/10000)*100% = .5%

With 95% confidence, Yes!

z = (51.17 - 50)/.5 = 2.34 > 2

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