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

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

Year	X =U.S. Production of Motor vehicles	Y =Tons of Domestic Steel
2000	12.83 million	16.06 million
2001	11.52	14.06
2002	12.33	14
2003	12.15	15.88
2004	12.02	13.86

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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