Need explanation for question 9 and 10

9. 64% of students at a university live on campus. A random sample found that 27 of 45 male students and 42 of 55 of female students live on campus. At the 0.05 level of significance, is there sufficient evidence to support the claim that a difference exists between the proportions of male and female students who live on campus? A) Yes, because the test value -18.93 is outside the noncritical region -1.96