Managed by Sparky Anderson, the Reds of the 1970s were a virtual Hall of Fame gallery with Rose, Joe Morgan, Johnny Bench and Tony Perez. This team won back-to-back world championships (1975-76), four pennants and six division titles. Four Reds won Most Valuable Player awards.
Pooled standard deviation is a way to find a better estimate of the true standard deviation given several different samples taken in different circumstances where the mean may vary between samples but the true standard deviation (precision) is assumed to remain the same. It is calculated by. or with simpler notation,
DEFINITION of 'Standard Deviation'. 1. A measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation. Standard deviation is calculated as the square root of variance.2. In finance, standard deviation is applied to the annual rate of return of an investment to measure the investment's volatility. measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation. Standard deviation is calculated as the square root of variance. 2.