miles driven, x values (350, 275, 310, 289, 341, 237, 336) cost of fuel, y values (27.30, 20.79, 25.74, 21.11, 28.66, 21.33, 27.58) coefficient r? linear regression line where =miles driven n y= cost to fill up.... last, if regression line is useful, estimate the cost to fill up for 325 mile trip n is the predictor useful