subset of a population measure of variability used to determine how frequency table far raw scores in a data distribution lie from that distribution's mean. Calculated as the 6. square root of the variance. Particularly useful measure when data exhibits normalear- normal distribution. It's the "sigma" in "six- median sigma" statistical process control technique used in many workplace environments. graphical method for displaying the shape of a 2 : sample variance) variance ( 6 2 : population variance) ($ 7. data distribution; particularly useful when the sample/data set/population is large tabular display showing values (or intervals of 8 values) and the corresponding number of histogram times those values appear (or fall within an interval) in a distribution individual piece of data ("datum") found within mode a data set/sample/population 10 symbol & variable representing the sum of raw scores in a data set / data distribution 11 variable representing the number of raw scores in a data set / data distribution