Graph description: Figure 1. Distribution of PEFR for 54 male medical students, with 20 repeated measurements for two students

There are two panels, each showing histograms on the same scale. The upper panel shows a roughly symmetrical, unimodal distribution range 450 to 720 litres/min. labelled "54 male students". The lower panel shows two histograms of roughly symmetrical, unimodal distributions. One is labelled "Student A" and has range 660 to 700 litres/min, the other is labelled "Student B" and has range 520 to 540 litres/min.

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Last updated: 21 April, 2008.