In a study, nine tires of a particular brand were driven on a track under identi

Question

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". This data point will be referenced in Question 15. The equation of the least-squares regression line is: Tread Depth = 360.64 - 11.39 times (thousands of miles) Also, r^2 = 0.953. We might feel comfortable using the least-squares regression equation to predict tread depth for a tire driven a. roughly between 0 and 30 thousand miles. b. roughly between 0 and 50 thousand miles. c. more than 50 thousand miles. d. cannot be determined from the information provided.

Explanation / Answer

Answer:

We might feel comfortable using the least square regression equation to predict tread depth for a tire driven

a). Roughly between 1 and 30 thousand miles.

Note : r2 is high and the range of x values is 0 to 30.

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