Case1 Digital Cell Phone

Case1 Digital Cell Phone - CASE 1: DIGITAL CELL PHONE, INC....

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CASE 1: DIGITAL CELL PHONE, INC. Objectives: Selection of an appropriate time series forecasting model based upon a plot of the data. The importance of combining a qualitative model with a quantitative model in situations where technological change is occurring. A plot of the data indicates a linear trend (least squares) model might be appropriate for forecasting. Using linear trend you obtain the fol- lowing: x y x 2 xy y 2 1 480 1 480 230400 2 436 4 872 190096 3 482 9 1446 232324 4 448 16 1792 200704 5 458 25 2290 209464 6 489 36 2934 239121 7 498 49 3486 248004 8 430 64 3440 184900 9 444 81 3996 197136 10 496 100 4960 246016 11 487 121 5357 237169 12 525 144 6300 275625 13 575 169 7475 330625 14 527 196 7378 277729 15 540 225 8100 291600 16 502 256 8032 252004 17 508 289 8636 258064 18 573 324 10314 328329 19 508 361 9652 258064 20 498 400 9960 248004 21 485 441 10185 235225 22 526 484 11572 276676 23 552 529 12696 304704 24 587 576 14088 344569 25 608 625 15200 369664 26 597 676 15522 356409 27 612 729 16524 374544
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Case1 Digital Cell Phone - CASE 1: DIGITAL CELL PHONE, INC....

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