Examine the regression and scatterplot showing the regression line, 95% confidence intervals, and 95% prediction intervals using 2006 and 2010 energy use (kg oil equivalent per $ 1000 GDP) for a sample of 31 countries first examined in Exercise 54. The response variable is 2010 Energy Use.

a) Explain the meaning of the 95% prediction intervals in this context.
b) Explain the meaning of the 95% confidence intervals in this context. You can see the regression model in Exercise 54. The extraordinary point is Iceland. If we set it aside, the model looks like this

c) How has setting aside Iceland changed the regression model? How is it likely to affect the intervals discussed in a) and b)?

500 as 300 200 100 150 200 250 300 350 400 Energy Use 2006 Response variable is: Energy Use 2010 R squared., 88.6% s 13.10 with 32 2 30 degrees of freedom Variable Coefficient SE(Coeff) t-Ratio P-Value Intercept 5.74436 . 0.634 0.5309 Energy 2006 0.921540 0.0605 5.2