Measures of Dispersion (Grade 10 NSC Matric Mathematics): Flashcards
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Dispersion
Dispersion
How values are distributed around the centre
Range formula
Range formula
Maximum value - Minimum value
Range sensitivity
Range sensitivity
Very sensitive to outliers
Percentile rank formula (for th percentile)
Percentile rank formula (for th percentile)
Q1 (first quartile) as percentile
Q1 (first quartile) as percentile
25th percentile
Q2 (second quartile) as percentile
Q2 (second quartile) as percentile
50th percentile (median)
Q3 (third quartile) as percentile
Q3 (third quartile) as percentile
75th percentile
IQR (Interquartile range) formula
IQR (Interquartile range) formula
IQR advantage over range
IQR advantage over range
Less sensitive to outliers, focuses on middle 50% of data
Deciles
Deciles
Divide ordered data into ten equal groups