Scientists believe that a major cause of global warming is higher levels of carbon dioxide (CO₂) in the atmosphere. In the Journal of World-Systems Research (Summer 2003), sociologists examined the impact of foreign investment dependence on CO₂ emissions n = 66 in developing countries. In particular, the researchers modeled the level of CO₂ emissions in a year based on foreign investments and other independent variables measured 16 years earlier. The variables and the model results are listed in the next table. 

a. Interpret the value of R².

b. Conduct a test of overall model adequacy. Use α = .01.

c. Conduct a test to determine if agricultural production (x₅) is a statistically useful predictor of CO₂ emissions (y). Use α = .01.

Transcribed Image Text:

y= In(level of CO, emissions in current year) BEstimate T value p-value = Inforeign investments) .79 2.52 <.05 X2 = gross domestic investment X3 = trade exports .01 .13 >.10 -.02 -1.66 >.10 X4 = In(GNP) -44 -97 >.10 X5 = agricultural production -.03 -.66 >.10 X6 =1 if African country, O if not -1.19 -1.52 >.10 X, = In(level of CO, emissions) 56 3.35 <.001 R = 31