In Exercises let x = 0 represent 1990, x = 1 represent 1991, and so forth.

(a) Find a natural logarithm regression equation for the data in Table 1.17 and superimpose its graph on a scatter plot of the data.

(b) Estimate the number of cubic feet of natural gas produced by China in 2002. Compare with the actual amount of 1.15 trillion cubic feet in 2002.

(c) Predict when China’s natural gas production will reach 1.5 trillion cubic feet.

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Table 1.17 China's Natural Gas Production Year Cubic Feet (trillions) 1997 0.75 1998 0.78 1999 0.85 2000 0.96 2001 1.07