RESEARCH METHODOLOGY

Detailed explanation-1: -Three common measures of variability are the range, variance, and standard deviation of scores. In general, range measures the basic spread of scores, whereas variance and standard deviation measure the typical amount of spread within the scores.

Detailed explanation-2: -The standard deviation is the average amount of variability in your dataset. It tells you, on average, how far each score lies from the mean. The larger the standard deviation, the more variable the data set is.

Detailed explanation-3: -Measures of central tendency tell us what is common or typical about our variable. Three measures of central tendency are the mode, the median and the mean. The mode is used almost exclusively with nominal-level data, as it is the only measure of central tendency available for such variables.