NURSING ANM AND GNM

Detailed explanation-1: -It’s the measure of dispersion the most often used, along with the standard deviation, which is simply the square root of the variance. The variance is mean squared difference between each data point and the centre of the distribution measured by the mean.

Detailed explanation-2: -The standard deviation is simply the square root of the variance. This is a useful and interpretable statistic because taking the square root of the variance (recalling that variance is the average squared difference) puts the standard deviation back into the original units of the measure we used.

Detailed explanation-3: -The square root of the variance is called the Standard Deviation . Note that is the root mean squared of differences between the data points and the average.

Detailed explanation-4: -The variance is the the sum of squared deviations from the mean. The variance for population data is denoted by 2 (read as sigma squared), and the variance calculated for sample data is denoted by s2.