Sunday 0.5625 1.0020 1.046: Monday Tuesday Wednesday Thursday Friday Saturday 1.515 2.260 0.401 Discussion Questions 2 1. Figure 8.9 shows summer air visibility measurements for Denver, Colorado. The acceptable visibility standard is 100, with readings above 100 indicating clean air and good visibility, and readings below 100 indicating temperature inversions caused by forest fires, volcanic eruptions, or collisions with comets. a. Is a trend evident in the data? Which time-series techniques might be appropriate for estimating the average of these data? b. A medical center for asthma and respiratory diseases located in Denver has great demand for its services when air quality is poor. If you were in charge of developing a short-term (say, 3-day) forecast of vis- ibility, which causal factor(s) would you analyze? In other words, which external factors hold the potential to significantly affect visibility in the short term? c. Tourism, an important factor in Denver's economy, is affected by the city's image. Air quality, as measured by visibility, affects the city's image. If you were responsible for development of tourism, which causal factor(s) would you analyze to forecast visibility for the medium term (say, the next two summers)? The OM Explorer and POM for Windows software is available to all students using the 12th edition of this textbook. Go to http://www.pearsonhighered.com/krajewski to download 250 225 Year 2 200 Reduced important forecast Then, he in quant 175 150 Visibility rating 125 reflects sales da a few lc predict Happe that M foreca what 100 75 50 Year 1 25 22 25 28 31 3 6 9 12 15 18 21 24 27 30 FIGURE Summer A July August Date Dolavori to MOS -8 Problems these SI wit ma the If you purchased MyLab Operationsch Models software Check