For the 32 nations in Example 7, we found a correlation of 0.614 between Internet use and

Question:

For the 32 nations in Example 7, we found a correlation of 0.614 between Internet use and Facebook use (both as percentages of population). The regression equation is predicted Facebook use = 7.90 + 0.439 Internet use
a. Based on the correlation value, the slope had to be positive. Why?

b. Indonesia had an Internet use of 15.4% and Facebook use of 20.7%. Find its predicted Facebook use based on the regression equation.
c. Find the residual for Indonesia. Interpret.