Range, Interquartile and Semi-interquartile Ranges (Raw Data)
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The range of a set of numbers is the difference between the largest and the smallest number.
Calculate the range of the following numbers:
204, 210, 215, 220, 225, 234, 238, 240
= the largest number – the smallest number
= 240 – 204
Ungrouped Frequency Table-Range
The range of a frequency distribution with ungrouped events is calculated using the formula below.
The range = the upper boundary limit of the largest event – the lower boundary of the smallest event
Find the range of the points in the table above.
Firstly identify the largest and smallest points.
Largest point = 13
Smallest point = 7
Find the upper boundary limit of the largest and the lower boundary limit of the smallest.
Upper boundary limit of 13 is, 13.5
Lower boundary limit of 7 is, 6.5
= Upper boundary limit of 13 – lower boundary limit of 7
= 13.5 – 6.5
-Q2 (the middle quartile) is the median.
-Q1 (the lower quartile) is the median of the numbers to the left of, or below Q2.
-Q3 (the upper quartile) is the median of the numbers to the right of, or above Q2.
12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32
Find the lower, middle and upper quartiles of the data above.
Since the data is already in ascending order, identify the median.
12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32
22 is the median, therefore, Q2= 22
The median of the numbers to the left of Q2: 12, 14, 16, 18, 20
16 is the median, therefore, Q1 = 16
The median of the numbers to the right of Q2: 24, 26, 28, 30, 32
28 is the median, therefore, Q3 = 28
The interquartile range of a distribution is the difference between the upper and lower quartiles.
That is, interquartile range = Q3 – Q1
Therefore using the example above, the interquartile range is:
Interquartile range = Q3 – Q1
Q3 = 28
Q1 = 16
= 28 – 16
The semi-interquartile range of a distribution is half the difference between the upper and lower quartiles, or half the interquartile range.
Therefore, from the example above, it was determined that the interquartile range = 12.
Therefore, semi-interquartile range