Consider the Second-Order Model $$\hat { y } = - 3.24 + 1.12 x _ { 1 } + 2.57 x _ { 2 } - 3.22 x _ { 1 } x _ { 2 } + 5.78 x _ { 1 } ^ { 2 } = 4.69 x _ { 2 } ^ { 2 }$$

question 21

Multiple Choice

Consider the second-order model $$\hat { y } = - 3.24 + 1.12 x _ { 1 } + 2.57 x _ { 2 } - 3.22 x _ { 1 } x _ { 2 } + 5.78 x _ { 1 } ^ { 2 } = 4.69 x _ { 2 } ^ { 2 }$$
If $x _ { 2 }$ is held fixed at $x _ { 2 } = 3$ , describe the relationship between $y$ and $x _ { 1 }$ .

• A) The relationship between \(y\) and \(x _ { 1 }\) is quadratic with downward concavity.
• B) The relationship between \(y\) and \(x _ { 1 }\) is linear with negative slope.
• C) The relationship between \(y\) and \(x _ { 1 }\) is quadratic with upward concavity.
• D) The relationship between \(y\) and \(x _ { 1 }\) is linear with positive slope.

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