what is standard deviation ?, the numerical value which is nothing but the variability of all the observations., a measure of how spread out the data is in relation to the mean , standard deviation is the square root of what ?, variance , standard deviation , the symbol of standard deviation is ?, sigma , sigma2, purpose of standard deviation , determines the size of data spread, to measure the absolute measure of variability dispersion, what does it indicate ?, the observations of the data set which differs from the mean , how far the observations in a group that are spread out , what unit is standard deviation expressed in ?, squared units , same as observation .

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