An article in the Journal of Sound and Vibration (Vol. 151, 1991, pp. 383394) described

Chapter 11, Problem 11-8

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An article in the Journal of Sound and Vibration (Vol. 151, 1991, pp. 383394) described a study investigating the relationship between noise exposure and hypertension. The following data are representative of those reported in the article. y 1012514 6 2 3 x 60 63 65 70 70 70 80 90 80 80 y 5468457 9 7 6 x 85 89 90 90 90 90 94 100 100 100 (a) Draw a scatter diagram of y (blood pressure rise in millimeters of mercury) versus x (sound pressure level in decibels). Does a simple linear regression model seem reasonable in this situation? (b) Fit the simple linear regression model using least squares. Find an estimate of 2 . (c) Find the predicted mean rise in blood pressure level associated with a sound pressure level of 85 decibels.

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