Sampling Error - Rojo Research -- Estimates are based on a probability sampling technique. As a result, the true figures of Rojo Research estimates can lie within a range of + or - the published estimates. Standard Error is calculated by using the formula: 2 standard deviations = 2(√ P(100-P)/n). Where P = cume rating and n = sample size. The following table illustrates the results of this formula.
This table is read as follows:
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