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Examples
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The z-score is a ratio where the denominator is the population standard deviation divided by the square root of the sample size.
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You have to realize that the consultant is computing a z-score for the difference in averages.
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So if we had two groups one with an average score of 85 and other with an average score of 84, we could get a z-score of 33 with a big enough sample size.
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When I run a rank correlation between the federal personal income tax as a share of GDP against percent changes in fixed private investment, I get a z-score of about - 2.158.
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The z-score is a ratio where the denominator is the population standard deviation divided by the square root of the sample size.
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So if we had two groups one with an average score of 85 and other with an average score of 84, we could get a z-score of 33 with a big enough sample size.
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You have to realize that the consultant is computing a z-score for the difference in averages.
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I just did this in Excel and got that for this poll the z-score is 2.13, which corresponds to 98.34%.
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That table is essentially an abbreviated z-score table adapted for polls.
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You must calculate the z-score in order to find the percent probability that Obama is leading Clinton.
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