Use exploratory data analysis to determine whether there is a trend and/or seasonality in mobile home shipments (MHS). The data by quarter are shown in the following table.

Period	MHS		Period	MHS		Period	MHS		Period	MHS
Mar-81	54.9		Dec-84	66.2		Sep-88	59.2		Jun-92	52.8
Jun-81	70.1		Mar-85	62.3		Dec-88	51.6		Sep-92	57
Sep-81	65.8		Jun-85	79.3		Mar-89	48.1		Dec-92	57.6
Dec-81	50.2		Sep-85	76.5		Jun-89	55.1		Mar-93	56.4
Mar-82	53.3		Dec-85	65.5		Sep-89	50.3		Jun-93	64.3
Jun-82	67.9		Mar-86	58.1		Dec-89	44.5		Sep-93	67.1
Sep-82	63.1		Jun-86	66.8		Mar-90	43.3		Dec-93	66.4
Dec-82	55.3		Sep-86	63.4		Jun-90	51.7		Mar-94	69.1
Mar-83	63.3		Dec-86	56.1		Sep-90	50.5		Jun-94	78.7
Jun-83	81.5		Mar-87	51.9		Dec-90	42.6		Sep-94	78.7
Sep-83	81.7		Jun-87	62.8		Mar-91	35.4		Dec-94	77.5
Dec-83	69.2		Sep-87	64.7		Jun-91	47.4		Mar-95	79.2
Mar-84	67.8		Dec-87	53.5		Sep-91	47.2		Jun-95	86.8
Jun-84	82.7		Mar-88	47		Dec-91	40.9		Sep-95	87.6
Sep-84	79		Jun-88	60.5		Mar-92	43		Dec-95	86.4

1. On the basis of your analysis, do you think there is a significant trend in MHS? Is there seasonality?

2. What forecasting methods might be appropriate for MHS according to the guidelines in Table 2.1?