Specify the Rejection Region for the Wilcoxon Rank Sum Test $\mathrm { n } _ { 1 } = 7 , \mathrm { n } _ { 2 } = 5 , \alpha = 0.05$

Specify the rejection region for the Wilcoxon rank sum test in the following situation. $\mathrm { n } _ { 1 } = 7 , \mathrm { n } _ { 2 } = 5 , \alpha = 0.05$
$\mathrm { H } _ { 0 }$ : Two probability distributions, 1 and 2 , are identical
$\mathrm { H } _ { \mathrm { a } }$ : Probability distribution of population 1 is shifted to the right of the probability distribution for population 2