![]() You and your customers expect them to be accurate. Let's say that your company manufactures measuring cups for household kitchens. What does the score mean for me? I mean, really? If you manufacture mirrors for Hubble-like telescopes, you would measure every one (several times). ![]() If you manufacture ball bearings, you probably don't measure each one. Statisticians like to point out that the "Student t-test" is more appropriate for incompletely-sampled populations. s = square root of ( ( S (xi – m )2 ) / n ), for all i = 1 to n in the total population.s is the standard deviation: the square root of the variance.This is the sum of all observations, divided by the number of observations.m is the mean of the population: the average value.x is the "raw" score, to be standardized.The mathematical formula is: z = (x – m) / s, where: The "standard score", is the statistical measurement of "how far is one particular observation away from the standard deviation". Compute four different areas under the standard curve based on the z-value you enter.
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