Given a sample of size 150 of Bernoulli process X1 N Bem(p1) , and a sample of size 250 of Bernoulli process X2 N Bern(p2) , we obtain sample proportions 0.44 and 0.61 respectively. Give a 90 % symmetric confidence interval about 0.44 0.61 : 0.17 for the actual value of P1 332 - lower bound L : ' ' and upper bound U