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Figure 2.11 shows the anatomical site of the foot corn by randomised group for 201 patients (Farndon et al. 2013) who were taking part in a randomised controlled trial to investigate the effectiveness of salicylic acid plasters compared with usual scalpel debridement for treatment.

Figure 2.11 Anatomical site of corn on the foot by randomised group for 201 patients with corns

(Source: Farndon et al. 2013).

1 2.1 What type of graph is Figure 2.11?Bar chartPie chartHistogramScatterplotDot plot

2 2.2 What type of data in Figure 2.11 is anatomical site of foot corn?DiscreteNominalBinaryOrdinalContinuous

3 2.3 Using the data shown in Figure 2.11 which anatomical site of the corn on the foot was the least frequently reported patients in the corn plaster group? The least frequently reported anatomical site of the corn on the foot patients in the corn plaster group was:ApexProximal interphalangeal jointInterdigitalMetatarsal headPlantar calcaneus

4 2.4 Using the data shown in Figure 2.11, approximately how many patients in the scalpel treated group had corn on the proximal interphalangeal joint (middle part of toe on the top)?The approximate number of patients in the scalpel treated group with a corn on the proximal interphalangeal joint was:5811 50100

5 2.5 Using the data shown in Figure 2.11, what approximate percentage of the sample of patients in the corn plaster treated group had a corn on the metatarsal head (ball of the foot at the bottom)?The approximate percentage of patients in the corn plaster treated group who had a corn on the metatarsal head was:20%30%40%50%60%The baseline corn size, in mm, of 10 randomly selected patients from the corn plaster randomised controlled trial (RCT) (Farndon et al. 2013) are given below2 2 2 3 4 4 5 5 7 10

6 2.6 The mean corn size (in mm) for this sample of 10 patients is:1.02.03.04.04.4

7 2.7 The median corn size (in mm) for this sample of 10 patients is:1.02.03.04.04.4

8 2.8 The modal corn size (in mm) for this sample of 10 patients is:1.02.03.04.04.4

9 2.9 The range of corn sizes (in mm) for this sample of 10 patients is:1 to 10 2 to 52 to 103 to 113 to 12

10 2.10 The interquartile range (IQR) corn size (in mm) for this sample of 10 patients is:2 to 102 to 72 to 53 to 73 to 10

11 2.11 The variance in corn size (in mm2) for this sample of 10 patients is:0.82.53.54.46.5

12 2.12 The standard deviation corn size (in mm) for this sample of 10 patients is:0.82.53.54.46.5