Convert raw scores into standard Z-scores, calculate p-values, percentiles, and visualize shaded cumulative probabilities on an interactive standard bell curve.
The standard score, or Z-score, is the number of standard deviations by which the value of a raw score x is above or below the mean value of what is being observed. The formula is:
For samples with sample mean xฬ and sample standard deviation s, the formula is equivalently Z = (X - xฬ) / s.
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