Consider the following scatterplot, which depicts the tread depth (measured in mils, where 1 mil = 0.001 inch) versus the number of miles driven on the tire (measured in thousands of miles). The correlation between x and y:
A)is approximately 0.97.
B)is approximately -0.97.
C)is approximately 0.
D)cannot be computed because the trend is curved.

Question

Consider the following scatterplot, which depicts the tread depth (measured in mils, where 1 mil = 0.001 inch) versus the number of miles driven on the tire (measured in thousands of miles).  The correlation between x and y:
A)is approximately 0.97. 
B)is approximately -0.97. 
C)is approximately 0. 
D)cannot be computed because the trend is curved.

Quizplus · Accepted Answer

The scatterplot shows a strong negative linear relationship between tread depth and number of miles driven. Therefore, the correlation between x (number of miles driven) and y (tread depth) is negative. The correlation coefficient is approximated at -0.97.

Consider the Following Scatterplot, Which Depicts the Tread Depth (Measured