For questions 13-18, refer to the following information: Mancia et al. (2020) conducted a case-control study in the Lombardy region of Italy to examine the association between the use of angiotensin-converting-enzyme (ACE) inhibitors and the odds of coronavirus disease 2019 (COVID-19). There were 1,502 COVID-19 cases among the 8,071 patients who used ACE inhibitors. There were 4,770 COVID-19 cases among the 28,960 patients who did not use ACE inhibitors. Using a 0.05 significance level, you need to test the claim that the proportion of COVID-19 patients among those who used ACE inhibitors (group 1) is higher than the proportion of COVID-19 patients among those who did not use ACE inhibitors (group 2). To do so, answer each of the following questions. OPTIONAL PRACTICE QUESTIONS: The following are optional practice questions that you can work on after you submit your quiz. They will NOT be graded; however, you should be prepared to answer these types of questions on the final exam. Practice 1: What type of test can you use to determine whether the assumption of equal population variances is satisfied? Use this test to test the claim that the two population variances (for the progression and improvement/stabilization groups) are different. Hint: The larger critical value is 2.25. condo ovel coronay . Albumin is a pr it does not leak is body. Low alow Typing results. that g con group forby in the with a standard dewy ablizdunn group wt mificanse level, you need to test the Practice 2: Construct a 90% confidence interval estimate of the difference between the mean albumin level for patients who progressed and the mean albumin level for patients who improved/stabilized. Based on the result, does it appear that albumin levels differ between these groups? Be sure to interpret your confidence interval. point