Question: Acid rain. Two researchers measured the pH (a scale on which a value of 7 is neutral and values below 7 are acidic) of water collected from rain and snow over a 6-month period in Allegheny County, Pennsylvania. Describe their data with a graph and a few sentences:

4.57     5.62     4.12      5.29     4.64      4.31      4.30       4.39      4.45

5.67     4.39     4.52      4.26     4.26      4.40      5.78       4.73      4.56

5.08     4.41     4.12      5.51     4.82      4.63      4.29       4.60