Question: 12. Dissolved Oxygen Content Dissolved oxygen content is a measure of the ability of a river, lake, or stream to support aquatic life, with high

12. Dissolved Oxygen Content Dissolved oxygen content is a measure of the ability of a river, lake, or stream to support aquatic life, with high levels being better. A pollution-control inspector who suspected that a river community was releasing semitreated sewage into a river, randomly selected five specimens of river water at a location above the town and another five below. These are the dissolved oxygen readings (in parts per million

Above Town 4.8 5.2 5.0 4.9 5.1 Below Town 5.0 4.7 4.9

a. Use a one-tailed Wilcoxon rank sum test with a 5.05 to confirm or refute the theory.

b. Use a Student’s t-test (with a 5.05) to analyze the data. Compare the conclusion reached in part a.

Above Town 4.8 5.2 5.0 4.9 5.1 Below Town 5.0 4.7 4.9 4.8 4.9

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