(b) Suppose now that you have another dataset comprising a set of observations on a response variable and a single explanatory variable, which you had hoped to be able to analyse using linear regression. You make a first attempt and produce the residual plot shown in Figure 2. 1. 0.5 1 1.5 2.5 Fitted value Figure 2 A residual plot You wonder whether a transformation might allow a better analysis using linear regression. Which variable might you transform, and why? Residual

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