8. The data of the thrust of a jet-turbine engine (y), x₁=primary speed of rotation, x₂=secondary speed of rotation, and x₃=fuel flow rate are collected. It is known that all three independent variables (x) have positive effect on the dependent variable (y). The candidate regression model for the data is y = β₀+β₁x₁ + β₂x₂+ +β₃x₃. Answer the following questions based on the Excel report shown below.
【題組】c. Does the model coefficients consistent with the prior knowledge that all three independent variables (x) have positive effect on the dependent variable (y)? Why or why not? Explain your answer.
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