Problem
Shipments of Household Appliances. The time plot in Figure 17.18 shows the series of quarterly shipments (in million dollars) of US household appliances between 1985-1989 (data are available in ApplianceShipments.csv, data courtesy of Ken Black). If we compute the autocorrelation of the series, which lag (> 0) is most likely to have the largest coefficient (in absolute value)? Create an ACF plot and compare with your answer.
