Concept explainers
In west Texas, water is extremely important. The following data represent pH levels in ground water for a random sample of 102 west Texas wells. A pH less than 7 is acidic and a pH above 7 is alkaline. Scanning the data, you can see that water in this region tends to be hard (alkaline). Too high a pH means the water is unusable or needs expensive treatment to make it usable (Reference: C. E. Nichols and V. E. Kane, Union Carbide Technical Report K/UR-1).
These data are also available for download at the Companion Sites for this text. For convenience, the data are presented in increasing order.
Compute a 75% Chebyshev interval centered on the mean.
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