Sir i am stuck on this question

Question 11 15 points Save Answer In KSA, in one day 30000 Covid19 tests have been conducted. 972 of these tests turned to be positive. On another day: 20000 Covid19 tests have been conducted. 956 of these tests turned to be positive. At 0.01 significance level you want to check if the positive ratio has changed from one day to the other day? In this case what would be your test statistics