The scatterplot shown below represents a typical shape of a cubic regression model y = ?0 + ?1x + ?2x2 + ?3x3 + ?.
Which of the following is true about values of the regression coefficients?
A. ?1 > 0; ?2 < 0; ?3 > 0
B. ?1 > 0; ?2 > 0; ?3 > 0
C. ?1 < 0; ?2 > 0; ?3 > 0
D. ?1 < 0; ?2 < 0; ?3 > 0
Answer: A
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