ZJOSH6 ZJOSH6 18-11-2020 SAT contestada The following information is obtained from two independent samples selected from two normally distributed populations. n1 = 18 x1 = 7.82 σ1 = 2.35 n2 =15 x2 =5.99 σ2 =3.17 test at a 5% significance level if the two populations means are different