A. Suppose that based on the results of a recent study on the water produced by traditional water supply systems that were conducted by the Department of Health. A study found that of a random sample of 316 traditional water supply systems, 40 had coliform bacteria in the drinking water. As a benchmark comparison, in 2015 the DOH found that about 3.5% of the Philippine population have coliform bacteria-infected drinking water. The question of interest is whether, based on the results of this study, we can conclude that drinking water produced by traditional water supply systems is more contaminated than those produced by an alternative source of drinking water supply. Question 1: What test statistic appropriate to test the hypothesis? Question 2: What are the appropriate null and alternative hypothesis? Question 3: What is the value of the test statistic for this test? Question 4: What can you conclude about this test? B. Given the ? value and the z value. Indicate whether the decision is to reject or to accept the null hypothesis for each of the following: 1. ? = 0.05, z = 3.7, two-tailed 2. ? = 0.01, z = -1.98, two-tailed 3. ? = 0.01, z = -0.77, one-tailed 4. ? = 0.05, z = 2.2, one-tailed 5. ? = 0.01, z = -2.2, two-tailed