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lower quartile = 1/4(n+1)
upper quartile = 3/4(n+1)
where n is the number of the values.
Obviously the values have to be ordered from the lower to the higher: the number you'll get is the position in this order. Let's say you get 4 for your lower quartile, it means that the 4th value is your lower quartile.
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What is quartile deviational?
Quartile Deviation (QD)The quartile deviation is half the difference between the upper and lower quartiles in a distribution. It is a measure of the spread through the middle half of a distribution. It can be useful because it is not influenced by extremely high or extremely low scores. Quartile Deviation is an ordinal statistic and is most often used in conjunction with the median.why we calculating quartile deviation?
Who do you work out the upper and lower quartile?
you do work out the upper and lower quartile
What are characteristics of lower quartile?
25% of the observed values are smaller than the lower quartile.
Can interquartile range be used for any data eg data below the lower quartile to find if the data is spread out or close together or must we use the lower quartile for data below the lower quartile?
No, interquartile range cannot be for any data. The lower quartile for data must be used below the lower quartile.
What is the interquartile range equal to?
It is the upper quartile minus the lower quartile.
