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Mathematics · পরিভাষা
Range, quartiles কী?
অন্য নাম: range · quartile · interquartile range
Definition 8.7High School Mathematics · অধ্যায় 8 — Descriptive Statistics
For a sorted series:
the range is the difference between the largest and smallest values;
the first quartileQ1 is the smallest value such that at least a quarter (25%) of the values are ≤Q1; the third quartileQ3 is the smallest value such that at least three quarters (75%) of the values are ≤Q3;
the interquartile rangeQ3−Q1 measures the spread of the central half of the data.
The box plot of Example 8.9: the box spans the interquartile interval[Q1,Q3] and contains the central half of the data; the whiskers reach the extreme values.
উদাহরণ
Example 8.9
Take the 11 sorted values
2,3,5,5,6,7,8,9,9,10,12.
Median: position 211+1=6, so the median is 7. Q1: 411=2.75, round up to 3; the 3rd value is 5. Q3: 433=8.25, round up to 9; the 9th value is 9. Range: 12−2=10; interquartile range: 9−5=4.