Level 5: Base reasoning on regions of distribution that are quantified via proportion or percentage.
5A
Compare two distributions based on proportions within defined regions, such as above or below a cut-point or inter-quartile range.
"The effect of formula A lasts longer than formula B because the middle 50% of the cases in A lasted longer than the middle 50% of the cases in B."
"The proportion of severe colds with the medicine is much less than the usual proportion, so I think the medicine makes a difference."