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Z-Score: Definition, Calculation & Interpretation - Simply Psychology The SND (i.e. z-distribution) is always the same shape as the raw score distribution. For example, if the distribution of raw scores if normally
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The z-score can be calculated by subtracting the population mean from the raw score, or data point in question (a test score, height, age, etc.), then dividing the difference by the population standard deviation: z = x - μ σ where x is the raw
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The z-score can be calculated by subtracting mean by test value and dividing it by standard value. So, z = (x − μ)/ σ Where x is the test value, μ is the mean and σ