The second step in determining differences between percentages with two groups,requires that this difference be translated into a number of standard errors away from the hypothesized value of zero.

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This is true. In order to determine the statistical significance of the difference between two percentages, we need to calculate the standard error and use it to calculate a z-score, which tells us how many standard errors the difference is from the expected value of zero.

The Second Step in Determining Differences Between Percentages with Two