2009 midterm examination ECON 338

2009 midterm examination ECON 338 - 1. The data are three...

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1. The data are three years of quarterly electricity production in Australia. The ratio-to- moving-average method has been used, but some numbers are missing, indicated by asterisks. Not too surprisingly, the forecasts for the following year are not very good, since only three years of data were used. a) Find the missing numbers. b) Show the computation for 1.006842, the second number in the rough column. c) In the graph, are the predicted values shown as Series 1 or Series 2? Justify your answer. d) State what a weighted average is and show why the numbers in the MA column are weighted moving averages. t Yt MA ratio-to- MA rough rhohat Y~ ̀ 1 1254 0.99497 8 0.9890 1267.93 1 2 1290 1.00684 2 1.0008 1288.96 1 3 1379 1352.37 5 1.01968758 7 1.02877 5 1.0226 1348.51 4 4 1346 1420.62 5 0.94747030 4 0.99353 1 0.9876 1362.93 6 5 1535 1488.25 1.03141273 3 4.02412 5 0.9890 1552.05 3 6 1555 1560.87 5 0.99623608 6 1.0008 1553.74 8 7 1655 1594.62 5 1.03786156 6 1.0226 1618.41 3 8 1651 1588.12 5 1.03959071
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This note was uploaded on 02/28/2012 for the course ECON 338 taught by Professor Kmackenzie during the Spring '12 term at McGill.

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2009 midterm examination ECON 338 - 1. The data are three...

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