sm_chapter_15

sm_chapter_15 - CHAPTER 15 SOLUTIONS AND MINI-PROJECT NOTES...

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CHAPTER 15 SOLUTIONS AND MINI-PROJECT NOTES CHAPTER 15 UNDERSTANDING AND REPORTING TRENDS OVER TIME EXERCISE SOLUTIONS 15.1 a. Positive. b. Nonexistent. c. Negative. d. Positive. 15.2 a. No seasonal component. b. A definite seasonal component. c. A possible seasonal component, with sales around Christmas. d. A definite seasonal component with peaks around Christmas and the beginning of the school year. 15.3 A trend would indicate global warming. Seasonal effects would be easy to separate out, but long cycles might lead to an erroneous conclusion that there was global warming. That's why it's important to examine data for as many years as possible when making this assessment. 15.4 It would be better to adjust for inflation to have a fair comparison over the years. 15.5 Divide the cost each year by the Consumer Price Index for that year. 15.6 You should plot the rate of homicides. Divide the number of homicides by the population first. Otherwise, an increasing number of homicides could simply be due to the increase in population. An increase in the rate would reflect a true increase in severity of the problem. 15.7
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sm_chapter_15 - CHAPTER 15 SOLUTIONS AND MINI-PROJECT NOTES...

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