z test or T test

Q#3 test the association between injection against typhoid and exemption from attack from the following contingency table classes attacked Not attacked total inoculated 525 25 550 Not inoculated 600 50 650 total 1125 75 1200 Q#4 A finite population consist of following numbers: 2, 4, 6, 8, 10, 12, 14, 16, 18Draw all possible random sample of size 2 with replacement from the following population form a frequency distribution of sample mean and verify the relation