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.

(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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