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2. This question refers to the random variables X and Y from Question 1. Use your calculated values from that question while answering this question. (a) Let Z = X (13", where e is a constant to be specified. There is one value of e, for which Y and Z are uncorrelated. Find this value of a. [3 I'narks] (1)) Let W = Y + EJX . where E; is a constant to be specied. There is one value of b for which X and Vi" are uncorrelated. Find this value of b. [3 marks]