STATISTICAL TECHNIQUES AND TOOLS
MEASURES OF VARIABILITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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IQR
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MAD
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Either A or B
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None of the above
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Detailed explanation-1: -The IQR is the red area in the graph below. The interquartile range is a robust measure of variability in a similar manner that the median is a robust measure of central tendency.
Detailed explanation-2: -The mean and median are the two most common measures of center. The mean is often called the average. A measure of variability is a single number used to describe the spread of a data set.
Detailed explanation-3: -The mean and the median can be calculated to help you find the “center” of a data set. The mean is the best estimate for the actual data set, but the median is the best measurement when a data set contains several outliers or extreme values.
Detailed explanation-4: -The range tells you the spread of your data from the lowest to the highest value in the distribution. It’s the easiest measure of variability to calculate. To find the range, simply subtract the lowest value from the highest value in the data set.