Which measure of central tendency is most appropriate for a nominal variable such as blood group?
Correct answer: D. Mode
- A. Arithmetic mean
- B. Median
- C. Geometric mean
- D. Mode
Explanation
Nominal categories have no meaningful numerical order or distance, so their most frequent category is summarized by the mode. Arithmetic, median and geometric means require numerical interpretation that blood groups do not provide.
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About Measures of Central Tendency and Dispersion
Central tendency includes mean, weighted mean, median and mode for raw and grouped data. Dispersion covers range, quartiles, interquartile range, variance, standard deviation and coefficient of variation, including the effect of changes in scale and the distinction between a representative centre and the spread around it.
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