This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'Which is not a measure of dispersion? \nSelect and explain. \nA. Mean deviation, B. Standard deviation, C. Mode, D. Range', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c (Mode) Ref: Park, 19th ed, p. 701Measures of dispersion include:a) Mean deviationb) Standard deviationc) RangeThe range is the simplest measure of dispersion. It is the difference between the highest and lowest figures in the sample.Mean deviation-is the average of the deviations from the arithmetic mean, and is given by the fonnulaStandard deviation- is the most frequently used measure of deviation. It is defined as the root mean square deviation.Measures of central tendency include# Mean# Mode -- not affected by the extreme items.# Median', 'role': 'assistant'}]