Find a 98% confidence interval for the difference in pH between the northern and southern side.
In the article “Groundwater Electromagnetic Imaging in Complex Geological and Topographical Regions: A Case Study of a Tectonic Boundary in the French Alps” (S. Houtot, P. Tarits, et al., Geophysics, 2002:1048–1060), the pH was measured for several water samples in various locations near Gittaz Lake in the French Alps. The results for 11 locations on the northern side of the lake and for 6 locations on the southern side are as follows:
Northern side: 8.1 8.2 8.1 8.2 8.2 7.4
7.3 7.4 8.1 8.1 7.9
Southern side: 7.8 8.2 7.9 7.9 8.1 8.1
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