[See Steps] If beta #770;_1 is positive in the equation (1) Y i = 0 + 1 X 1i + 2 X 2i + i , it could be negative in the equation (2) Y i = 0 + 1 X 1i +
Question: If \[{{\hat{\beta }}_{1}}\] is positive in the equation (1) Y i = 0 + 1 X 1i + 2 X 2i + i , it could be negative in the equation (2) Y i = 0 + 1 X 1i + 2 X 2i + 3 X 3i + i , . (3 points)
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