standard deviation

IN MATH: 1. n. the standard average difference between the mean and each of the scores. 2. n. the square root of the variance.

The reader is probably familiar with computing an arithmetic average or mean. The formula for a sample mean is and a population mean is . This standard sort of averaging is also used in computing a standard deviation, standard (meaning usual) deviation (meaning difference) . Standard deviation means the average difference between the scrores and the mean, computed in the usual way.

The formula for the standard deviation of a sample and a population are and

IN ENGLISH: 1. as defined above.

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