# Turn standard deviation and variance relationship

### Standard Deviation and Variance

Calculation of the mean of the means of samples (or standard error of the mean) . Laboratorians tend to calculate the SD from a memorized formula, without making of squares that leads to variance which in turn leads to standard deviation. The standard deviation of the mean (SD) is the most commonly used measure of SD is calculated as the square root of the variance (the average squared deviation Interquartile range is the difference between the 25th and 75th centiles. An explanation of Variance, Covariance and Correlation in rigorous yet clear terms providing a more general and intuitive look at these.

В тот момент Сьюзан поняла, за что уважает Тревора Стратмора. Все эти десять лет, в штиль и в бурю, он вел ее.

Уверенно и неуклонно.