Write an inequality for the sentence
then solve.
fifteen less than a number is at most 6

a. x+15< (with a line under it)6; x< (with a line under it)-9**
b. x-15< (with a line under it)6; x> (with a line under it) 21
c. x-15 > (with a line under it)6; > (with a line under it)21
d. x-15> (with a line under it)6; x> (with a line under it)16

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) ).