If a constant value 4 is subtracted from each observation of a set, the value of the variance is
(1) reduced by 4 (2) reduced by 16 (3) reduced by 2 (4) unaltered
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C
unaltered
Variance is the mean of the squares of the deviations from the mean. Therefore, if a constant value that is 15 is subtracted from each observations of the set, then the variance will not be altered as the effect of such a act will be managed at the time of calculating the deviations of the series.
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