A linear regression analysis was done in R for the relationship between speed Y (km/hour) and density X (vehicle/km) for a road segment yielded the following output. The sample size is 40. Please fill in the estimated value below. Estimate Std. Error t value Pr(>|t|) (Intercept) 1 0.40869 245.168 ? 2 0.01957 -97.865 ? (a) Based on the results above, write the formulation of the estimated linear regression model: 3 Please interpret the (b) Please interpret the intercept estimate: coefficient of density: 5. 4 (c) In the generalized f-test, the f-statistic has degree of freedom in the denominator. Enter the correct answer below. 1 Please enter a number for this text box. 2 Please enter a number for this text box. 3 4 Please enter a number for this text box.

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