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The zscore is a ratio where the denominator is the population standard deviation divided by the square root of the sample size.

You have to realize that the consultant is computing a zscore for the difference in averages.

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 zscore of 33 with a big enough sample size.

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 zscore of about  2.158.

The zscore is a ratio where the denominator is the population standard deviation divided by the square root of the sample size.

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 zscore of 33 with a big enough sample size.

You have to realize that the consultant is computing a zscore for the difference in averages.

I just did this in Excel and got that for this poll the zscore is 2.13, which corresponds to 98.34%.

That table is essentially an abbreviated zscore table adapted for polls.

You must calculate the zscore in order to find the percent probability that Obama is leading Clinton.
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