A hospital compares mean waiting times of 41.8 and 39.9 minutes using pictograms whose heights and widths are both proportional to the means. The vertical scale begins at 39 minutes.
Explain two ways the display exaggerates the change.
Suggest a fairer display and two further summaries needed to judge performance.
105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.