Use the following linear regression equation to answer the questions. X1=1.9+3.6x 2 -7.5x 3 +2.1x 4 a) which number is the constant term? List the coefficients with their corresponding explanatory...

Use the following linear regression equation to answer the questions.
X1=1.9+3.6x₂-7.5x₃+2.1x₄

a) which number is the constant term? List the coefficients with their corresponding explanatory variables.
constant=
x₂
coefficient =
x₃coefficient =
x₄coefficient =


b) If x₃and x₄were held at fixed but arbitrary values and x₂increased by 1 unit. What would be the corresponding change in x₁?
suppose x₂increased by 2 units. What would be the expected change in x₁?
suppose x₂decreased by 4 units. What would be the expected change in x₁?
c) Suppose that n=13 data points were used to construct the given regression equation and that the standard error for the coefficient of x₂is 0.433. Construct a 95% confidence interval for the coefficient of x₂. (Use 2 decimal places)