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Quartile Deviation : It is based on the lower quartile and the upper quartile. The difference is called the inter quartile range. The difference divided by is called semi-inter-quartile range or the quartile deviation.Thus. The quartile deviation is a slightly better measure of absolute dispersion than the range.But it ignores the observation on the tails. If we take difference samples from a population and calculate their quartile deviations, their values are quite likely to be sufficiently different.t is based on the lower quartile and the upper quartile. The difference is called the inter quartile range. The difference divided by is called semi-inter-quartile range or the quartile deviation. Thus. The quartile deviation is a slightly better measure of absolute dispersion than the range.
Determine the quartiles of the variable. A variable is normally distributed with mean 16 and standard deviation 2. Determine the quartiles of the variable. Obtain and interpret the 85th percentile. Find the value that 65% of all possible values of the variable exceed. Find the two values that divide the area under the corresponding normal curve into middle area of 0.95 and two outside areas of 0.025. Request for Solution File.