Consider the first-order model = 50 - 10x1 + 8x2 - 2x1x2.A 1-unit increase in x1,while holding x2 constant at a value of 4,decreases the value of y,on average,by:
A) 42
B) 40
C) 18
D) an amount that depends on the value of x1
Correct Answer:
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