Cl. Normality Consider the linear model Y = x + E. i. State the four mathematical assumptions required for inference. List each assumption separately. ii. Express the assumptions in (i) as a single distributional assumption on the error vector. iii. Express the linear model as a single distributional assumption on the response vector. iv. Write the sampling distribution of the OLS estimator B. npl 0.2 v. Write the sampling distribution of Era