The article “Occurrence and Distribution of Ammonium in Iowa Groundwater” (K. Schilling, Water Environment Research, 2002:177–186) describes measurements of ammonium concentrations (in mg/L) at a large number of wells in the state of Iowa. These included 349 alluvial wells and 143 quaternary wells. The concentrations at the alluvial wells averaged 0.27 with a standard deviation of 0.40, and those

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The article “Occurrence and Distribution of Ammonium
in Iowa Groundwater” (K. Schilling, Water
Environment Research, 2002:177–186) describes
measurements of ammonium concentrations (in
mg/L) at a large number of wells in the state of Iowa.
These included 349 alluvial wells and 143 quaternary
wells. The concentrations at the alluvial wells averaged
0.27 with a standard deviation of 0.40, and those
at the quaternary wells averaged 1.62 with a standard
deviation of 1.70. Find a 95% confidence interval for
the difference in mean concentrations between alluvial
and quaternary wells.

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