During the years 2005–2009, the world record for the 100-meter dash was repeatedly broken as never before. The years and corresponding record times are in data file XR17008 and shown in the table. Using x = 1 through 5 to represent years 2005–2009, fit a secondorder polynomial model to the data and estimate the world record time for the 100-meter dash in 2014.
Answer to relevant QuestionsAn early edition of Car and Driver magazine reported the engine horsepower, top speed (mph), curb weight (pounds), and 0–60 mph acceleration time (seconds) for a selection of automobiles that ranged from large American ...What are the four components of a time series, and to what kind of variation in the series does each refer? For the data of Exercise 18.11, fit an exponentially smoothed curve with smoothing constant α = 0.4; with smoothing constant α = 0.7. Which constant provides more “smoothing” and why? Which curve is quicker to “catch ...Given the data of Exercise 18.13, (a) determine the monthly seasonal indexes for January through December, then (b) use these indexes to deseasonalize the original time series. In exercise If a time series is such that sales are consistently increasing from one year to the next, will exponential smoothing tend to produce forecasts that are (a) over or (b) under the sales that are actually realized for the ...
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