SAT Math Multiple Choice Question 679: Answer and Explanation

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Question: 679

4. The variables x and y are believed to correlate according to the equation y = ax2 + bx + c, where a, b, and c are constants. Which of the following scatterplots would provide the strongest evidence in support of the hypothesis that a < 0?

  • A. Images
  • B. Images
  • C. Images
  • D. Images

Correct Answer: C

Explanation:

C

Data Analysis (graphing data) MEDIUM-HARD

The graph of the quadratic y = ax2 + bx + c is a parabola. If a < 0, the parabola is "open-down" like a frowny-face. The only graph with this feature is (C).

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