The following is sales value data from Microsoft companies from 1984 to 1998: Year Sales Revenue Year Sales Revenue Year

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The Following Is Sales Value Data From Microsoft Companies From 1984 To 1998 Year Sales Revenue Year Sales Revenue Year 1 (52.18 KiB) Viewed 78 times

The following is sales value data from Microsoft companies from 1984 to 1998: Year Sales Revenue Year Sales Revenue Year Sales (s Million) ($ Million) Revenue ($ Million) 1998 14000 1993 3753 1988 590.8 1997 11358 1992 2758.7 1987 345.9 1996 8671 1991 1843.4 1986 202.1 1995 5937 1990 1183.4 1985 139.5 1994 4649 1989 803.5 1984 99.5 a. Construct a time series plot, and interpret the pattern b. Make a demand model guess: S = a + bt c. Make an approximation of the demand model: S = S,(1+g) d. Make a demand model guess: S = S, e" e. Interpret the coefficients of the 3 models, and test whether they are significant f. Which model is more suitable (for example for forecasting) in your opinion?