Least-Squares Fit The table lists the actual annual cost y to drive a midsize car 15,000 miles per year for selected years x.
x | 1970 | 1980 | 1990 | 2000 | 2010 |
y | $1763 | $3176 | $5136 | $6880 | $8595 |
Source: Runzheimer International.
(a) Predict whether the correlation coefficient is positive, negative, or zero.
(b) Find a least-squares regression line that models these data. What is the correlation coefficient?
(c) Estimate the cost of driving a midsize car in 2005.
(d) Estimate the year when the cost to drive a car could reach $10,000.
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