An article in the journal of sound and vibration (vol. 151, 1991, pp. 383-394) described a study investigating the relationship between noise exposure and hypertension. the following data are representative of those reported in the article. y x y x 1 60 5 85 0 63 4 89 1 65 6 90 2 70 8 90 5 70 4 90 1 70 5 90 4 80 7 94 6 90 9 100 2 80 7 100 3 80 6 100 fit a linear regression model relating blood pressure rise in millimeters of mercury (y) to sound pressure level in decibels (x) using least squares.