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Question 295:



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To calculate a z-score you need the mean, standard deviation and some data-point you are wishing to convert to a standardized value (z-score).  With the raw value you convert it to a z-score by subtracting the mean and dividing that result by the standard deviation.

For example, given a test with a mean of 100 and standard deviation of 15 a raw score of 120 has a z-score of (120-100)/15 = 1.333. You can see these standardized values in the interactive graph of the standard normal curve.

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