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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