(2) The release of sewage from storm sewers into surface waters can reduce the d
ID: 562654 • Letter: #
Question
(2) The release of sewage from storm sewers into surface waters can reduce the dissolved oxygen (d.o.) concentration in the water. Many biologists maintain that d.o. concentrations below 5.0 ppm can have adverse effects on some fish species. In one particular study, weekly measurements of d.o. were made in a river near a sewage discharge source over a 2 month period as shown below: Week | d.o. (ppm) 4.9. 5.1 2 3 5.6 ona w N 4.3 4.7 4.9 4.5 | 8 5.1 n we be 95% confident that the wen d.o. concentration is below 5.0 ppm? (4 points)Explanation / Answer
yes. As the average value for the above experiment data is bellow 5.0 ppm.
average value: total data of d.o / no of weeks
avg d.o.= (4.9+5.1+5.6+4.3+4.7+4.9+4.5+5.1 )/ 8 = 4.89 ppm
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