RESEARCH METHODOLOGY

Detailed explanation-1: -Standard deviation (SD) is the most commonly used measure of dispersion. It is a measure of spread of data about the mean. SD is the square root of sum of squared deviation from the mean divided by the number of observations.

Detailed explanation-2: -The variance and the standard deviation are measures of the spread of the data around the mean. They summarise how close each observed data value is to the mean value.

Detailed explanation-3: -We use a relative measure of dispersion for comparing distributions of two or more data set and for unit free comparison. They are the coefficient of range, the coefficient of mean deviation, the coefficient of quartile deviation, the coefficient of variation, and the coefficient of standard deviation.

Detailed explanation-4: -Standard deviation, Range, Mean absolute difference, Median absolute deviation, Interquartile change, and Average deviation are examples of measures of dispersion.