pH Levels in Water A sampling ofthe acidity of rain for 10 randomly selectedrainfalls
Chapter 15, Problem 36(choose chapter or problem)
pH Levels in Water A sampling ofthe acidity of rain for 10 randomly selectedrainfalls was recorded at three different locations in theUnited States: the Northeast, the Middle Atlanticregion, and the Southeast. The pH readings for these30 rainfalls are shown in the table. (NOTE: pH readingsrange from 0 to 14; 0 is acid, 14 is alkaline. Pure waterfalling through clean air has a pH reading of 5.7.)Northeast Middle Atlantic Southeast4.45 4.60 4.554.02 4.27 4.314.13 4.31 4.843.51 3.88 4.674.42 4.49 4.283.89 4.22 4.954.18 4.54 4.723.95 4.76 4.634.07 4.36 4.364.29 4.21 4.47a. Do the data present sufficient evidence to indicatedifferences in the levels of acidity in rainfalls in thethree different locations? Test using the KruskalWallis H-test.b. Find the approximate p-value for the test in part aand interpret it.
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