1. Fit a cubic polynomial (centered) model to the chicken data and see if it improves the fit. Have the data and the cubic fit in one plot.
2. Generate a signal xt = 1+3t +et, with n = 200 and where.i)et ~N(0,100);ii) et ~ 0.3wt 0.3wt1 + 0.4wt2.
3. For i) and ii) above, estimate and remove the trend. Examine the acf of the residuals.

USING R STUDIO. CHCKEN DATA FOUND IN ASTSA PACKAGE IN R