Passenger Travel The table shows the number of miles (in trillions) traveled by passengers of all types x years after 1970.
Year (1970 ↔ 0) 0) | 0 | 10 | 20 | 30 | 40 |
Miles (trillions) | 2.2 | 2.8 | 3.7 | 4.7 | 5.5 |
Source: Department of Transportation.
(a) Make a scatterplot of the data. Predict whether the correlation coefficient will be positive or negative.
(b) Use least-squares regression to find f(x) = ax + b so that f models the data.
(c) Graph f and the data. Interpret the slope.
(d) Predict the number of passenger miles in 2015.
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