The following data show U.S. production of motor vehicles versus tons of domestic steel shipped for motor vehicle manufacture.

a. Determine the least-squares regression line and calculate r.
b. What proportion of the variability in steel shipments for motor vehicles is explained by the regression equation?
c. During a year in which U.S. production of motor vehicles is 12.0 million, what would be the prediction for the number of tons of domestic steel used for vehicle production?

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x = U.S. Production of Motor Vehicles y = Tons of Domestic Steel Year 12.83 million 16.06 million 2000 2001 11.52 14.06 2002 12.33 14.00 2003 12.15 15.88 12.02 2004 13.86