D Question 11 5 pts A research study aimed at evaluating the efficacy of aspirin in the prevention of thrombosis among patients under dialysis gave the following results (please use the results to answer questions 11 through 13): Development of thrombosis Yes No Total Placebo Group 18 7 25 Aspirin Group 6 12 18 Total 24 19 43 What is the correct null (HO) hypothesis? O HO: two groups have the same proportions of development of thrombosis O HO: two groups have significantly different proportions of development of thrombosis O HO: two groups proportions of development of thrombosis cannot be compared O HO: Placebo group have higher proportions of development of thrombosis D Question 12 5 pts What is the correct test statistics to use? O T-test O X2-test O Two-way ANOVA O Z-test D Question 13 5 pts The p-value is calculated as p=0.012 based on the test statistics. What is(are) the correct conclusion(s)? Select all correct conclusions. Reject null hypothesis with alpha = 0.1 Reject null hypothesis with alpha = 0.05 O Reject null hypothesis with alpha = 0.01 O Reject null hypothesis with alpha = 0.001 None of the above