AQA GCSE · Question 02 · Statistical Measures and Calculations
Which one of these is not a measure of spread?
Answer options:
A.
interdecile range
B.
interpercentile range
C.
standard deviation
D.
skewness
How to approach this question
Consider the definition of each term. A measure of spread (or dispersion) describes how varied or spread out the data points are. Three of the options fit this description. One of them describes the shape or symmetry of the data distribution.
Full Answer
D.skewness✓ Correct
Measures of spread (or dispersion) include the range, interquartile range, interdecile range, and standard deviation. They quantify how far apart the data values are. Skewness, on the other hand, measures the asymmetry of the data distribution. A distribution can be symmetric (zero skew), positively skewed (tail to the right), or negatively skewed (tail to the left). It describes the shape, not the spread.
Common mistakes
✗ Confusing skewness with measures of spread.\n✗ Not knowing the definitions of interdecile range or interpercentile range.
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