The quarterly sales of the TRK-50 mountain bike for the previous four years by a bicycle shop in Switzerland is presented in the following table. Year 1 2 3 Quarter 1 2 3 4 1 2 3 4 1 2 3 st 4 1 2 W|N 3 4 t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Yt 10 31 43 16 11 33 45 17 13 34 48 19 15 37 51 21 (a) By using a software of your choice, plot the time series (b) What kind of trend appears to exist? (c) What type of seasonal variation appears to exist? (d) Is a transformation needed to obtain a series that displays constant variation? (e) Fit a proper model with trend and seasonal variations terms. (f) Do all the independent variables seem to be important? Justify your answer
The quarterly sales of the TRK-50 mountain bike for the previous four years by a bicycle shop in Switzerland is presented in the following table. Year 1 2 3 Quarter 1 2 3 4 1 2 3 4 1 2 3 st 4 1 2 W|N 3 4 t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Yt 10 31 43 16 11 33 45 17 13 34 48 19 15 37 51 21 (a) By using a software of your choice, plot the time series (b) What kind of trend appears to exist? (c) What type of seasonal variation appears to exist? (d) Is a transformation needed to obtain a series that displays constant variation? (e) Fit a proper model with trend and seasonal variations terms. (f) Do all the independent variables seem to be important? Justify your answer
Chapter4: Linear Functions
Section4.3: Fitting Linear Models To Data
Problem 24SE: Table 6 shows the year and the number ofpeople unemployed in a particular city for several years....
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