Problem-Solving and Data AnalysisHardDescribing an association from a scatterplot summary
Problem-Solving and Data Analysis practice question
In a scatterplot, each point shows a car's age x, in years, and its resale value y, as a percentage of its original price. The points lie close to a line, with older cars having lower values. Which statement best describes the relationship?
- A. There is a strong negative linear association between age and resale value.Correct
- B. There is a strong positive linear association between age and resale value.
- C. There is no association between age and resale value.
- D. The association is strong, but it is not linear.
Answer: A. There is a strong negative linear association between age and resale value.
Close to a line: strong and linear. Older means lower: negative.
Why the other answers are wrong
- B. There is a strong positive linear association between age and resale value.
- Older cars are worth LESS, so the association is negative.
- C. There is no association between age and resale value.
- Points close to a line show a clear association.
- D. The association is strong, but it is not linear.
- 'Close to a line' means linear.
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