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A pollution-control inspector suspected that a riverside community was releasing semitreated sewage into a river and this, as a consequence, was changing (reducing) the level of dissolved oxygen of the river.

A pollution-control inspector suspected that a riverside community was releasing semitreated sewage into a river and this, as a consequence, was changing (reducing) the level of dissolved oxygen of the river. To check this, he drew 15 randomly selected specimens of river water at a location above the town and another 15 specimens below. The dissolved oxygen readings, in parts per million, are given in the table to the left, and in a different but equivalent form on sheet two of this file.

Generate the appropriate test using both Excel and SAS. Include both outputs in your homework.

On the top page of your homework, (with no statistical output) write a summary paragraph in full sentences, completely devoid of statistical jargon - no more than three sentences - which the city council of the town could read and would understand the outcome of the study.

Above Below
5.2 4.2
4.8 4.4
5.1 4.7
5.0 4.9
4.9 4.6
4.8 4.8
5.0 4.9
4.7 4.6
4.7 5.1
5.0 4.3
4.7 5.5
5.1 4.7
5.0 4.9
4.9 4.8
4.9 4.7

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Solution Summary

A pollution-control inspector suspected that a riverside community was releasing semitreated sewage into a river and this, as a consequence, was changing (reducing) the level of dissolved oxygen of the river. To check this, he drew 15 randomly selected specimens of river water at a location above the town and another 15 specimens below. The dissolved oxygen readings, in parts per million, are given in the table to the left, and in a different but equivalent form on sheet two of this file.

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