Select all of the following that represent the symbol for the angle whose vertex is point S and whose sides pass through points R and C.∠CRS∠CRS∠SCR∠SCR∠CSR∠CSR∠C∠C∠R∠R∠ RCS∠RCS∠SRC∠SRC∠S∠S∠RSC

Consider the linear model for a two-stage nested design with b nested in a as given below. yijk=\small \mu + \small \taui + \small \betaj(i) + \small \varepsilon(ij)k , for i=1,; j= ; k=1, assumption: \small \varepsilon(ij)k ~ iid n (0, \small \sigma2) ; \small \taui ~ iid n(0, \small \sigmat2 ); \tiny \sum_{j=1}^{b} \small \betaj(i) =0; \small \varepsilon(ij)k and \small \taui are independent. using only the given information, derive the least square estimator of \small \betaj(i) using the appropriate constraints (sum to zero constraints) and derive e(msb(a) ).