1-Sample Hypothesis Tests for Means Student Study Sesslon 8. Environmental law requires that the waste water from Molybdenum mining near Taos, New Mexico be pumped to tailing ponds. The pipeline running from one mine has leaks and the contaminated water runs into the Red River. An environmental group interested in local water supplies collects the volume of contaminated water leaked per day for a random sample of 40 days and nds that the pipeline is leaking an average of 1.61 million gallons of contaminated water per day with a standard deviation of 0.6 million gallons. A dotplot of their data is shown below. 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Volume Regulations on the company's mining permit states that the mining company has to keep the volume of contaminated water entering the river below 1.5 million gallons per day. (a) Is there sufcient evidence at the a: = 0.05 level to conclude that the mining company is not in compliance with the regulations? Provide statistical justication for your answer. (b) Assuming that the true mean amount of contaminated water leaked by this pipeline is 1.55 million gallons, what could the environmental group do to increase the power of the test in part (a)? Explain how your approach would increase the power of the test