Statistics

In a study, nine tires of a particular brand were driven on a track under identical conditions. Each tire was driven a particular controlled distance (measured in thousands of miles), and afterward the tread depth was measured. Tread depth is measured in “mils.” Here, 1 mil is 0.001 inch. The least-squares regression line was computed, and added to a scatterplot of these data. On the plot, one data point is marked with an “X”.

The equation of the least-squares regression line is:

Tread Depth = 360.64 – 11.39x (thousands of miles)

Also, r2 = 0.953.

The least-squares line would predict that the tread depth of a tire driven 16 thousand miles would be?

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  1. Substitute 16 for x and solve for tread depth in the equation.

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  2. Thank you! :)

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  3. 178

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