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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.”
“The z-score 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 z-score of 33 with a big enough sample size.”
“You have to realize that the consultant is computing a z-score for the difference in averages.”
“I just did this in Excel and got that for this poll the z-score is 2.13, which corresponds to 98.34%.”
“That table is essentially an abbreviated z-score table adapted for polls.”
“You must calculate the z-score in order to find the percent probability that Obama is leading Clinton.”
“Then calculate the z-score and then look up the z-score on a statistics table.”
“I noticed you didn't even bother to calculate a z-score with your analysis.”
“Recalculating the z-score I get 1.58, which correlates to 94.3% that Obama is 'truly' ahead of Hillary.”
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