1 In general, what is true about the relationship between the Sum of Squared Residuals in the restricted and unrestricted model? O a. SSRr = 55Rur O b. SSRr SSRur 2. Which test is used for testing if multiple coefficients are jointly significantly different from zero? O a t-test O b. Breusch-Pagan test O C. R-squared test O d. F-test 3. Consider the following econometric model birthweight = Bo + B1smoking + u where birthweight is a baby's weight at birth in grams and smoking is a dummy variable indicating whether the mother was smoking during pregnancy (smoking = 1) or not (smoking = 0). What does P1 show? O a the causal effect of birth weight on smoking O b. the causal effect of smoking on birth weight Can estimate of the causal effect of smoking on birth weight O d. the birth weight of a baby with a smoking mother