=+b) Explain why you are not surprised that the sign of the slope is positive.

The researcher adds two variables to the regression and finds:

Dependent variable is: GDP per Capita R squared = 80.00%

s = 7327.65 with 96 - 4 = 92 df Term Estimate SE(Coeff) t-Ratio P-value Intercept 2775.98251 2803.32606 0.99 0.3247 Cell phones/

100 people 92.84968 37.38697 2.48 0.0148 Internet users per 100 people

(2004) 480.49061 54.04020 8.89 60.0001 Primary completion rate -63.28454 32.25614 -1.96 0.0528