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The following data represent x 5 boat sales and y = boat trailer sales from 1995 through 2000. Source: Bureau of the Census, Statistical Abstract of the United States 1999, p. 269 and Statistical Abstract 2002, p. 755.
Year
Boat Sales (Thousands)
Boat Trailer Sales (Thousands)
1995
649
207
1996
619
194
1997
596
181
1998
576
174
1999
585
168
2000
574
159
a. Determine the least-squares regression line and inter- pret its slope.
b. Estimate, for a year during which 500,000 boats are sold, the number of boat trailers that would be sold.
c. What reasons might explain why the number of boat trailers sold per year is less than the number of boats sold per year?
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