Paper 1 · Research Aptitude
An example of a categorical variable is
AA teacher's hair colour ✓ Correct
BThe average time a teacher takes to grade an essay
CThe distance a teacher travels from office to class
DThe time a sportsperson takes to complete a lap
Correct answer: (A) A teacher's hair colour — A teacher's hair colour is an example of a categorical variable, so that is the answer.
Explanation
★A teacher's hair colour is an example of a categorical variable, so that is the answer.
★A categorical variable sorts cases into named categories, not numbers.
★Hair colour places people into groups such as black, brown or grey, which are categories.
★The average time to grade an essay is a measured number, a quantitative variable.
★Distance travelled is likewise a measured quantity, not a category.
★Time to complete a lap is a number too, so only hair colour is a categorical variable.
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