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3. Given that y = 2x1 + 22 2 = -21 - 2 Find the variance-covariance matrix for y and z. If Sx, = 12,

3. Given that y = 2x1 + 22 2 = -21 - 2 Find the variance-covariance matrix for y and z. If Sx, = 12, Sxia, = 0.6 and x1 = u + 2v where Su = 13, Su = 15 and Suv = 0

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