Analysis of Canadian Manufacturing Workers Work-Hours.The time series plot in Figure 6.10 describes the average annual number of weekly hours spent by Canadian maufacturing workers. The data in CanadianWorkers.xls.

Which one model of the following regression-based models would fit the series best? Linear trend model Linear trend model with seasonality Quadratic trend model Quadratic trend model with seasonality

Year	Hours per week
1966	37.2
1967	37
1968	37.4
1969	37.5
1970	37.7
1971	37.7
1972	37.4
1973	37.2
1974	37.3
1975	37.2
1976	36.9
1977	36.7
1978	36.7
1979	36.5
1980	36.3
1981	35.9
1982	35.8
1983	35.9
1984	36
1985	35.7
1986	35.6
1987	35.2
1988	34.8
1989	35.3
1990	35.6
1991	35.6
1992	35.6
1993	35.9
1994	36
1995	35.7
1996	35.7
1997	35.5
1998	35.6
1999	36.3
2000	36.5