Sewage and industrial pollutants dumped into a body of water can reduce the dissolved oxygen concentration and adversely affect aquatic species. In one study, weekly readings are taken from the same location in a river over a two-month period. Week Number Dissolved O2, ppm 1 4.9 5.1 5.6 4.3 2 3 4.7 6 4.9 7 4.5 8 5.1 Some scientists think that 5.0 ppm is a dissolved O2 level that is marginal for fish to live. Conduct a statistical test to determine whether the mean dissolved O2 concentration is less than 5.0 ppm at the 95% confidence level. State clearly the null and alternative hypotheses.
Sewage and industrial pollutants dumped into a body of water can reduce the dissolved oxygen concentration and adversely affect aquatic species. In one study, weekly readings are taken from the same location in a river over a two-month period. Week Number Dissolved O2, ppm 1 4.9 5.1 5.6 4.3 2 3 4.7 6 4.9 7 4.5 8 5.1 Some scientists think that 5.0 ppm is a dissolved O2 level that is marginal for fish to live. Conduct a statistical test to determine whether the mean dissolved O2 concentration is less than 5.0 ppm at the 95% confidence level. State clearly the null and alternative hypotheses.
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter13: Solutions And Their Behavior
Section: Chapter Questions
Problem 23PS: A sealed flask contains water and oxygen gas at 25 C. The O2 gas has a partial pressure of 1.5 atm....
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Transcribed Image Text:Sewage and industrial pollutants dumped into a body of water can reduce the dissolved
oxygen concentration and adversely affect aquatic species. In one study, weekly readings
are taken from the same location in a river over a two-month period.
Week Number
Dissolved O2, ppm
1
4.9
2
5.1
3
5.6
4.3
4.7
4.9
4.5
8.
5.1
Some scientists think that 5.0 ppm is a dissolved O2 level that is marginal for fish to live.
Conduct a statistical test to determine whether the mean dissolved O2 concentration is
less than 5.0 ppm at the 95% confidence level. State clearly the null and alternative
hypotheses.
OPP
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