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Unformatted text preview: that was mentioned in class, namely 2 1 DW= . Use this formula with the original DW statistic, and perform the CochraneOrcutt transformation again. This time you should find that the procedure improves the DW statistic. 4. Use the equation found in question 3 to predict the next four values of t Y ~ . 5. MINITAB gives the following PIs for t Y ~ for the next four quarters: 59.1069 76.7691 60.5979 78.3634 62.0861 79.9604 63.5716 81.5602 Use these numbers to get PIs for t Y . Of course for t = 33, 1 . 71 1 =t Y . For t = 34, 35, 36 use the first three values you got in question 4. Do the PIs you get actually contain the real values that were observed, namely those below? 2004 1 56.7 2 62.5 3 62.5 4 74.5...
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 Spring '09
 G
 Algebra

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