National Deforestation Rates

1
National Deforestation Rates

• C -gt Q

2
Type of Study

• Paired, Two-Sample, or Multi-Sample?
• Paired Study
• Comparing the amount of forest cover in each
  nation in 1990 to the amount in 2000 -AND-
• Multi-Sample Study
• In the article countries are grouped into samples
  by continent.

3
Data Acquisition

• Where was the deforestation data for this article
  obtained?
• The United Nations Food and Agriculture
  Organization (UNFAO)
• How did the UN most likely obtain this
  information? (experiment or observational
  study?)
• Observational Study

4
Data Presentation

• Deforestation Rates of Nations Categorized by
  Continent
• Excluding countries with less than 1,000,000
  hectares of forest and those with insufficient
  data

5
Data Presentation
6
Sample?

• Are these results for a sample or a population?
• Sample (only includes nations with sufficient
  data)
• Population (takes all nations into
  consideration)
• Also only includes nations in the U.N.
• Taiwan and Vatican City

7
Bias?
Country/area Population total 1990 (000) Population Growth Rate () Forest Total in 2000 ('000 ha) Forest of land area 2000 () Forest Change 1990-2000 (000 ha) Forest Annual rate of change 1990-2000 ()
Brazil 167,988 1.3 543,905 64.3 -2,309 -0.4
World 5,978,143 1.3 3,869,455 29.6 -9,391 -0.2
8
Data Presentation

• Deforestation Rates of Nations Categorized by GDP
  per Capita
• Excluding countries with less than 1,000,000
  hectares of forest and those with insufficient
  data

9
Data Presentation