METHODS OF DATA ANALYSIS
MEASURES OF DISPERSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The range
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The standard deviation
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Either A or B
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None of the above
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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. This formula is a definitional one and for calculations, an easier formula is used.
Detailed explanation-2: -Relative measures of dispersion are known as the coefficient of dispersion, and it is the standard deviation to the mean. So, it is difficult to compute.
Detailed explanation-3: -Standard Deviation (s) It is the better measure of dispersion compared to range and IQR because unlike range and IQR, the Standard deviation utilizes all the values in the data set in its calculation. The square of the standard deviation is called Variance(s2).