Acid Rain In 2002, the median pH level of the rain in Glacier National Park, Montana
Chapter 15, Problem 7(choose chapter or problem)
Acid Rain In 2002, the median pH level of the rain in Glacier National Park, Montana, was 5.25. A biologist thinks that the acidity of rain has decreased since then. (This would mean that the pH level of the rain has increased.) She obtains a random sample of 15 rain dates in 2011 and obtains the following data: 5.31 5.19 5.55 5.38 5.37 5.19 5.26 5.29 5.27 5.19 5.27 5.36 5.22 5.28 5.24 Source: National Atmospheric Deposition Program Test the hypothesis that the median pH level has increased from 5.25 at the a = 0.05 level of significance.
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