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San Diego State University Operations And Supply Chain Management Assignment Help - Model


Question - An article in W ear (Vol. 152, 1992, pp. 171–181) presents data on the fretting wear of mild steel and
oil viscosity. Representative data follow, with x = oil viscosity and y = wear ear volume (10 –4 cubic
millimeters).




(a) Construct a scatter plot of the data. Does a simple linear regression model appear to be plausible?
(b) Fit the simple linear regression model using least squares. Find an estimate of s2.
(c) Predict fretting wear when viscosity x = 30. (d) Obtain the fitted value of y when x = 22.0 and
calculate the corresponding residual.

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