Exam MAS-I Practice Question 137
Study guide: Exam MAS-I
A scatter plot of average collision severity against vehicle age (0 to 14 years) shows a tight, symmetric arch: severity climbs over the first six years, peaks around year 7, and then falls steadily, returning by age 14 to about the level it started from. The sample correlation between severity and vehicle age is r = 0.05.
What do the plot and the correlation together indicate?
- A) Severity depends strongly on vehicle age, but along a curve that the correlation does not measure
- B) Severity is nearly unrelated to vehicle age, so vehicle age can be left out of the severity model
- C) Severity rises slightly with vehicle age, so a small positive linear coefficient captures the effect
- D) Severity and vehicle age are independent, since a correlation near zero rules out any relationship
- E) The correlation must be in error, since a pattern this tight forces
|r|to be close to 1
Answer this question and see the worked solution