Question: Figure 9.11 shows a scatterplot and regression line of the relationship between the between distance walked, in metres on an endurance shuttle walk test before

Figure 9.11 shows a scatterplot and regression line of the relationship between the between distance walked, in metres on an endurance shuttle walk test before (pre) and after (post) a physiotherapy rehabilitation programme in 100 patients with Chronic Obstructive Pulmonary (COPD) disease.

2000 1800 1600 1400 1200 1000 Post-rehabilitation distance walked (metres) 800 600

Figure 9.11 Scatterplot and regression line of the relationship between the between distance walked, in metres on an endurance shuttle walk test before (pre) and after

(post) a physiotherapy rehabilitation programme in 100 patients with Chronic Obstructive Pulmonary (COPD) disease.

From Figure 9.11, what do you think is the approximate correlation between pre and post rehabilitation distance walked?

A. −1.0 B. −0.5 C. 0.0 D. 0.4 E. 0.8

2000 1800 1600 1400 1200 1000 Post-rehabilitation distance walked (metres) 800 600 400 200 0 8 8 8 300 400 500 600 700 Pre-rehabilitation distance walked (metres) 100 200

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