deviation value 79

This means we need to know how to compute the standard deviation of the sampling distribution of the difference. By using the Z transformation, we can convert any normal distribution into a normal distribution with a mean of 0 and a standard deviation of 1. For convenience, we repeat the key steps below. In contrast, the actual value of the CV is independent of the unit in which the measurement has been taken, so it is a dimensionless number.



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