An Environmental Protection agency sets limits on concentration of lead. The upper limit is set at an average level of 11.0 ppm within area of four km of a plant. To check compliance with regulation a random sample of 100 reading taken at different times and distances is obtained. It was found that the concentration was 12.0 ppm, and a standard deviation of these readings is 4.0 ppm. Is there sufficient evidence to conclude that the plant is violating the EPA limit? alpha = 0.05

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