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Question
In the quadratic regression model y = 
0 + 1X1 + 2X12 + 
, if the term 2 is ___________ zero, then the parabola opens ____________.
A. less than, upward
B. greater than, upward
C. greater than, either upward or downward
D. less than, either upward or downward
E. equal to, downward
Answer
This answer is hidden. It contains 2 characters.
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