EXERCISE 3. time series Sketch without proof the ACF and PACF for the following 1) AR(1) with -0.5. 2) AR(1) with -_0.5. 3) MA(1) with -0.5 4) MA(1) with -_0.5. 15 15 15 15) EXERCISE 3. time series Sketch without proof the ACF and PACF for the following 1) AR(1) with -0.5. 2) AR(1) with -_0.5. 3) MA(1) with -0.5 4) MA(1) with -_0.5. 15 15 15 15)