Measurements of the variable of interest will differ between subjects. As a result the outcome of an experiment may be different from what was expected. The psychologist will want to know whether that difference is purely the result of random variation between subjects or if it is due to some other factor. The standard deviation is a measure for determining how large a difference might be purely random.
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Information is not sufficient to find mean deviation and standard deviation.
Standard deviation is the square root of the variance.
Standard deviation is a statistical concept and not applicable to concrete.
we calculate standard deviation to find the avg of the difference of all values from mean.,
Standard deviation can be greater than the mean.