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In a regression analysis involving 30 observations, the following estimated regression equation was obtained.

? = 17.6 + 3.8x₁ - 2.3x₂ + 7.6x₃ + 2.7x₄

a) Interpret b₁, b₂, b₃, and b₄ in this estimated regression equation. Assume that for each coefficient statement, the remaining three variables are held constant.

b) Estimate y when x₁ = 10, x₂ = 5, x₃ = 1, and x₄ = 2 (to 1 decimal).

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