Understanding Cumulative Frequency Curves

Knowing how to draw a graph or curve serves little purpose if, once complete, you don’t know how to interpret what the curve means.

I’ve run across many a textbooks that do an excellent job of explaining how to draw a specific type of graph, but then fall short on discussing interpretations of the graph (what the graph means).

The webpage below does an excellent job of

(i) revising how one makes a  cumulative frequency curve and then

(ii) discussing the interpretation of the curve – especially what is meant by Lower Quartile, Upper Quartile and Inter-Quartile Range.

Cumulative Frequency

The webpage includes four worked examples and a short list of common errors to avoid when drawing Cumulative Frequency Curves.

Thanks to the UK’s Training and Development Agency for providing this resource.  Visit Cumulative Frequency.