Z-Test analysis tools: Two examples for the average z-Test is performed using two examples for the known average variance. This tool is used to test for an empty sommutithan that there is no difference between the two population mean value. If you do not know the variance, that is, the probability that the value of z is distance from 0 in the same direction the observed z value when there is no difference between the population mean the "P (z = Z <) two-tail" the truth is that P (Z > = ABS (z) or Z = ABS (z)-, <) Z is the value away from each direction 0 to z notice when there is no difference between the population mean test results from two-way is just presenting the results of a one-way test comes multiplied by 2 z-Test Tools.
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