Question 1
a). Using the ACF graph, a trend is identified, which shows seasonality. The first trough shows the high season whereas the second trough represents the slack. After the ninth period, the graph shifts to the negative side, which may signify a low season. The PACF graph shows that a majority of periods of high are followed by a low period. This, however, is different for some periods where a period of high is followed by two consequent lows. This is a non-linear trend for the Mobile Home Shipment.
b). From the autocorrelation analysis, there is an evident time series. A time series is when there is a ...