Airline Travel The table at the top of the next column lists the numbers of airline passengers in millions at some of the largest airports in the United States during 2002 and 2006.
(a) Graph the data by using the 2002 data for x-values and the corresponding 2006 data for y-values. Predict whether the correlation coefficient will be positive or negative.
(b) Use a calculator to find the linear function f based on least-squares regression that models the data. Graph y = f(x) and the data in the same viewing rectangle.
(c) In 2002 Newark International Airport had 29.0 million passengers. Assuming that this airport followed a trend similar to that of the five airports listed in the table, use f(x) to estimate the number of passengers at Newark International in 2006. Compare this result to the actual value of 36.7 million passengers.
Airport
2002
2006
Atlanta (Hartsfield)
76.9
84.4
Chicago (O’Hare)
66.5
77.6
Los Angeles (LAX)
56.2
61.0
Dallas/Fort Worth
52.8
60.2
Denver
35.7
47.3
Source: Airports Association Council International.
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