For the following multiple regression model: 
, a unit increase in x 1, holding x 2 and x 3 constant, results in:
A) a decrease of 3 units on average in the value of y .
B) an increase of 8 units in the value of y .
C) an increase of 3 units on average in the value of y .
D) None of these choices.
Correct Answer:
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