Forced expiratory volume (FEV) is a measure of the rate of airflow (L/min) during one deep exhalation. FEV was measured for each of 60 students between 65 and 73 inches tall. The scatterplot below shows FEV plotted against height. The triangles in the plot are the average FEV values for each height. The SD line and the regression line are shown. Which line -the dotted line or the dashed line -is the SD line, and which line is the regression line?18

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800 600 64 66 68707274 Height (in)