4   Question 1 continued At the start of the therapy (T0), Giovanni measures the patients’ ability to balance using the “Berg balance scale”. He repeats this measure at the end of the course of therapy (T1), and at a follow‑up appointment one month later (T2). Giovanni displays his results using box and whisker plots, shown in Figure 1. * * T0 T0 T1 T1 T2 T2 Control group Experimental group Berg balance scale 60 50 40 30 20 10 0 [Source: http://dx.doi.org/10.1155/2014/580861] Figure 1 A higher score on the Berg balance scale indicates better balance. (d) Make four distinct comments, in context, about Giovanni’s experiment and on his results using the information shown in Figure 1 only. (4) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Turn over 5   Question 1 continued _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (e) Highlight one advantage and one disadvantage of Giovanni’s choice of box and whisker plots to display his results. (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (Total for Question 1 is 9 marks)