1) what is standard deviation ? a) the numerical value which is nothing but the variability of all the observations. b) a measure of how spread out the data is in relation to the mean  2) standard deviation is the square root of what ? a) variance  b) standard deviation 3) the symbol of standard deviation is ? a) sigma b) sigma2 4) purpose of standard deviation a) determines the size of data spread b) to measure the absolute measure of variability dispersion 5) what does it indicate ? a) the observations of the data set which differs from the mean b) how far the observations in a group that are spread out 6) what unit is standard deviation expressed in ? a) squared units b) same as observation

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