A sampling of the acidity of rain for 10 randomly selected rainfalls was recorded at three different locations in the United States: the Northeast, the Middle Atlantic region, and the Southeast. The pH readings for these 30 rainfalls are shown in the table.

a. Do the data present sufficient evidence to indicate differences in the levels of acidity in rainfalls in the three different locations? Test using the Kruskal- Wallis H-test.
b. Find the approximate p-value for the test in part a and interpret it.

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Northeast Middle Atlantic Southeast 4.45 4.02 4.13 3.51 4.42 3.89 4.18 3.95 4.07 4.29 4.60 4.27 4.31 3.88 4.49 4.22 4.54 4.76 4.36 4.21 4.55 4.31 4.84 4.67 4.28 4.95 4.72 4.63 4.36 447 2