The company Transport Laviolette wants to establish a maintenance policy for the trucks in its fleet. All of them are of the same model and used for similar transports. The company's management believes that a statistical link between the direct cost of travel (Y) (cents per km) and the time elapsed (in months) (X) since the last time this truck was checked would be useful. Therefore, a number of data were collected on these two variables and are presented below.

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