For the past decade, rubber powder has been used in asphaltcement to improve

Chapter 12, Problem 18

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For the past decade, rubber powder has been used in asphaltcement to improve performance. The article ExperimentalStudy of Recycled Rubber-Filled High-Strength Concrete(Magazine of Concrete Res., 2009: 549556) includes aregression of onbased on the following sample data:x 112.3 97.0 92.7 86.0 102.0 99.2 95.8 103.5 89.0 86.7y 75.0 71.0 57.7 48.7 74.3 73.3 68.0 59.3 57.8 48.5a. Obtain the equation of the least squares line, and interpretits slope.b. Calculate and interpret the coefficient of determination.c. Calculate and interpret an estimate of the error standarddeviation s in the simple linear regression model.

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