Could you please solve the question

lQuestion 1. Consider a simple linear regression model with no intercept yi =11i+si, 1i= 1,...,n, [1) Iwhere 31 is a slope parameter, errors 51; are uncorrelated with zero mean and common variance 02. [c] [7 marks] i. If we write the above model Ilvittl no intercept {1} in the usual form of the general linear model I = X + a, then what is the design matrix X? What is ? ii. Find XTX, [XTX)_1 and JET-1;. iii. Consider the above model with no interoept in the mah'ix form. Using the results for the general linear models and parts i_ and ii. above, nd the least squares estimator of 31 and derive an expression for an unbiased estimator of 03