= a): If the series yt is a AR(2), then the ACF Pk O for k > 3 and the PACF, Okk for k = 1, 2, 3, ..., shows an oscillating decay. (4 Marks) b): If the series yt is a MA(1) with $1 0, the ACF can show an oscillating decay. (4 Marks) log2 + 2P+9+1 d): The second term in the AIC ( AIC -) and SC (SC = log2 + T p+a+1 FlogT) criteria formulae is a penalty for lack of parsimony in the ARM A(p,q) T model. (4 Marks) e): Differencing a trending series will not remove a deterministic trend. (4.5 Marks) = a): If the series yt is a AR(2), then the ACF Pk O for k > 3 and the PACF, Okk for k = 1, 2, 3, ..., shows an oscillating decay. (4 Marks) b): If the series yt is a MA(1) with $1 0, the ACF can show an oscillating decay. (4 Marks) log2 + 2P+9+1 d): The second term in the AIC ( AIC -) and SC (SC = log2 + T p+a+1 FlogT) criteria formulae is a penalty for lack of parsimony in the ARM A(p,q) T model. (4 Marks) e): Differencing a trending series will not remove a deterministic trend. (4.5 Marks)