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which is a better measure of spread: range or interquartile range? why?

It is better to use the interquartile range for the best measure of spread rather than range. If either the maximum or minimum number is an outlier, this can throw off the entire range and misinforms about what the true measure of spread is. The interquartile range is often a more useful piece of information. The difference of the upper quartile and lower quartiles incorporate more actual information and data points from the spread, and are a good representation of the spread of the data.

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