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Worksheet Mattel in Assignment 5.xlsx contains total quarterly revenues for Mattel, Inc. (the famous American toy manufacturer) between 2005 and 2012.

Worksheet "Mattel" in "Assignment 5.xlsx" contains total quarterly revenues for Mattel, Inc. (the famous American toy manufacturer) between 2005 and 2012.

  1. Develop a multiple regression model that combines seasonal effects and a trend component for these data. Carefully describe how you build this model and how you would interpret the slopes of the independent variables.
  2. Based on your model from part a), what revenues would you predict for the second and the fourth quarter of 2013, respectively?
Year Month Period CPI-U
2019 Jan 1 251.712
2019 Feb 2 252.776
2019 Mar 3 254.202
2019 Apr 4 255.548
2019 May 5 256.092
2019 Jun 6 256.143
2019 Jul 7 256.571
2019 Aug 8 256.558
2019 Sep 9 256.759
2019 Oct 10 257.346
2019 Nov 11 257.208
2019 Dec 12 256.974
2020 Jan 13 257.971
2020 Feb 14 258.678
2020 Mar 15 258.115
2020 Apr 16 256.389
2020 May 17 256.394
2020 Jun 18 257.797
2020 Jul 19 259.101
2020 Aug 20 259.918
2020 Sep 21 260.280
2020 Oct 22 260.388
2020 Nov 23 260.229
2020 Dec 24 260.474
2021 Jan 25 261.582
2021 Feb 26 263.014
2021 Mar 27 264.877
2021 Apr 28 267.054
2021 May 29 269.195
2021 Jun 30 271.696
2021 Jul 31 273.003
2021 Aug 32 273.567
2021 Sep 33 274.310
2021 Oct 34 276.589
2021 Nov 35 277.948
2021 Dec 36 278.802
2022 Jan 37 281.148
2022 Feb 38 283.716
2022 Mar 39 287.504
2022 Apr 40 289.109
2022 May 41 292.296
2022 Jun 42 296.311

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