These levels of noise are considered those which will

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These levels of noise are considered those which will permit spoken conversation and other activities such as sleeping, working and recreation, which are part of the daily human condition. http://www2.epa.gov/aboutepa/epa-identifies-noise-levels-affecting-health-and-welfare
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Student materials Interpreting Data: Muddying the Waters S-1 © 2015 MARS, Shell Center, University of Nottingham Muddying The Waters The manager of the Riverside Center is concerned about visitor numbers. He is certain the Center’s popularity has been badly affected by an increase in river pollution. He feels the local Environmental Agency should do something about it. To support his argument he measured the chemical concentration in the river each month. He also counted the number of people visiting the Center over several months. He used the results to draw this chart: Scatter chart: Chemical concentration and number of visitors At the same time the manager asked 18 visitors this question: The odor you can smell originates from the pollution in the river. Is it spoilin g your enjoyment of the Center?’ He displayed the results as a pie chart. Pie chart showing the percentage of visitors whose enjoyment was spoiled.
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