=+28. Urban storm water can be contaminated by many sources, including discarded batteries. When ruptured, these batteries

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=+28. Urban storm water can be contaminated by many sources, including discarded batteries. When ruptured, these batteries release metals of environmental significance. The article “Urban Battery Litter”

(J. of Environ. Engr., 2009: 46–57) presented summary data for characteristics of a variety of batteries found in urban areas around Cleveland.

Here are data on zinc mass (g) for two different brands of size D batteries:

Brand Sample Size Sample Mean Sample SD Duracell 15 138.52 7.76 Energizer 20 149.07 1.52

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