An ecologist for the state of Missouri has monitored the mercury level in the ground water near a large smelting plants.

An ecologist for the state of Missouri has monitored the mercury level in the ground water near a large smelting plants. The ecologist took a random sample of 15 area wells and determine the mercury level in these wells. The measurements in milligrams/m3 were: 0.99, 1.03, 1.07, 1.07, 1.20, 1.25, 1.35, 1.44, 1.60, 1.61, 1.77, 1.80, 1.87, 2.4, and 2.19. The average of these values is 1.49 and standard deviation is 0.389 mg/m3. A court settlement requires that the smelter stop operations of the mercury level in the nearby ground water has an average of more than 1.25 mg/m3. They ecologist believes that the measurements of mercury concentrations are approximately normally distributed. Conduct a test of hypothesis to see if the average is greater than 1.25 mg/m3