To answer this question, find the point in the graph that represents Michael’s 34-minute swim and then compare the actual heart rate for that swim with the expected heart rate as defined by the line of best fit. To find the point that represents Michael’s swim that took 34 minutes, look along the vertical line of the graph that is marked “34” on the horizontal axis. That vertical line intersects only one point in the scatterplot, at 148 beats per minute. On the other hand, the line of best fit intersects the vertical line representing 34 minutes at 150 beats per minute. Therefore, for the swim that took 34 minutes, Michael’s actual heart rate was 150−14=2 beats per minute less than predicted by the line of best fit. Choices A, C, and D are incorrect and may be the result of misreading the scale of the graph.