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 also available for download at the companion Sites for this text. For convenience, the data are presented in increasing order.
x: pH of Ground Water in 102 West Texas Wells
Make a frequency table, histogram, and relative frequency histogram using five classes. Recall that for decimal data, we “clear the decimal” to determine classes for whole-number data and then reinsert the decimal to obtain the classes for the frequency table of the original data.
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Understandable Statistics: Concepts and Methods
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill