Elementary Statistics ( 3rd International Edition ) Isbn:9781260092561
Elementary Statistics ( 3rd International Edition ) Isbn:9781260092561
3rd Edition
ISBN: 9781259969454
Author: William Navidi Prof.; Barry Monk Professor
Publisher: McGraw-Hill Education
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Chapter 15, Problem 3CS

Microorganisms play a crucial role in wastewater treatment by transforming solid organic matter into carbon dioxide and water In a wastewater treatment system, the solids retention time is average amount of time that solid organic matter resides in the treatment tank. A study was performed at the Colorado School of Mines to determine the relationship between the solids retention time and the diversity of the microorganism population. It was thought, because microorganisms feed on the solid matter, that longer retention times would provide more opportunity for genetic mutations to occur, resulting in a greater diversity of microorganisms.

Following are counts of the numbers of species of microorganism for retention times of 3 days, 12 days, and 30 days.

Chapter 15, Problem 3CS, Microorganisms play a crucial role in wastewater treatment by transforming solid organic matter into

Can you conclude at the α = 0.05 level that the median number of species for a retention time of 30 days differs from the median for a retention time of 12 days? Compute the appropriate test statistic, find the P-value, and state a conclusion.

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Elementary Statistics ( 3rd International Edition ) Isbn:9781260092561

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