Which statistical measure is calculated by subtracting the mean from a data point and then dividing that difference by the standard deviation, yielding a value that indicates how many standard deviations the data point lies from the mean?
Interquartile range
Z-score (standard score)
Standard deviation
Variance
The Z-score (also called a standard score) is found with the formula (value − mean) / standard deviation. The resulting number tells you precisely how many standard deviations the observation is above or below the mean. Variance squares the deviations and averages them, standard deviation is the square root of variance, and the interquartile range measures the spread of the middle 50 % of data-none of these convey the standardized distance of a single data point from the mean.
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