Discussion
If a frequency distribution has some extreme scores, then appropriate measure of variability will be .........
Answer: B
The appropriate measure is the quartile deviation.
The quartile deviation is half the distance between the first and third quartiles, so it depends only on the middle 50% of the scores and is not affected by extreme values at either end.
The range is decided entirely by the two extreme scores, and the average deviation and standard deviation use every score, so extreme values distort all three.
For the same reason the median, rather than the mean, is the preferred average for such skewed data.
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