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Q l a) Identify which of the following is true. false or uncertain. Rationalize your choices by providing examples where possible. Be precise. (6 marks) i) A regression model is linear if the slope of the model is nonconstant. Further by linearity we mean the linearity in terms of variables. ii} A good econometric model generally includes the randomness of the human behaviors as a separate independent variable. iii] Error term in the population regression function as well as the sample regression function is denoted by at. iv] The conditional and unconditional means of a random variable are same. v) Condence interval and test of significance are complementary approaches. vi] The coefficient of determination and F stat are not related to each other