A wastewater treatment program is designed to produce treatedwater with a pH of 7. Let represent the mean pH of watertreated by this process. The pH of 60 water specimens will bemeasured, and a test of the hypothesis Ho: = 7 versus H1 : =/ 7 will be made. Assume it is known from previousexperiments that the standard deviation of the pH of waterspecimens in approximately 0.5. a.If the test is made at the 5% level, what is the rejectionregion? A wastewater treatment program is designed to produce treatedwater with a pH of 7. Let represent the mean pH of watertreated by this process. The pH of 60 water specimens will bemeasured, and a test of the hypothesis Ho: = 7 versus H1 : =/ 7 will be made. Assume it is known from previousexperiments that the standard deviation of the pH of waterspecimens in approximately 0.5. a.If the test is made at the 5% level, what is the rejectionregion?