This question has 4 parts. A chemical plant can dispose a certain amount of wastewater into a river. The Environmental Protection Agency (EPA) takes samples of the river water at several locations downstream from the plant. If the plant complies with the EPA regulations, the population mean number of toxic particles in the water is ,u : 50 parts per million (ppm). Each day, the EPA selects 36 water samples and computes the average number of toxic particles, and then uses this information to determine if they should conclude that the population mean number of toxic particles is greater than 50 ppm. If so, the owner of the plant will be ned. Use the hypotheses H0 : ,u, g 50 ppm and HG : p > 50 ppm. It is known that the population standard deviation, 0, is 8 ppm of toxic particles. ii) Determine the test statistic for this test with a sample mean of 5: : 52.3 ppm 0 z = 2.23 O t : 1.725 O z : 1.725 O t = 2.23 O t = 1.725