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The z-statistic is calculated with the formula z = (sample statistic - null parameter)/(standard error). Why do we subtract the null parameter from the sample

The z-statistic is calculated with the formula z = (sample statistic - null parameter)/(standard error). Why do we subtract the null parameter from the sample statistic? In other words, what does subtracting achieve for us? Why do we then divide that value by the standard error?

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