The median price of existing single-family homes has increased consistently during the past few years. However, the data in Table 1.4 show that there have been differences in various parts of the country.

(a) Find the linear regression equation for home cost in the South.
(b) What does the slope of the regression line represent?
(c) Find the linear regression equation for home cost in the West.
(d) Where is the median price increasing more rapidly, in the South or the West?

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Table 1.4 Year 1999 2000 2001 2002 2003 Median Price of Single-Family Homes South (dollars) West (dollars) 145,900 173,700 148,000 196,400 155,400 213,600 163,400 238,500 168,100 260,900