Extremely low limits for mercury in wastewater effluent now exist. It is often thought that whenever the concentration of heavy metals is too high, the problem can be corrected by forcing industries to stop discharging the offending substance. It is possible however, for target effluent concentrations to be so low that they might be exceeded by the concentration in domestic sewage. Specimens of drinking water were collected from two residential neighborhoods, one served by the city water supply and the other served by private wells. The observed mercury concentrations are listed below. For future studies on mercury concentrations in residential areas, it would be convenient to be able to sample in either neighborhood without having to worry about the water supply affecting the outcome. Is there any difference in the mercury content of the two residential areas? The sample collection cannot be paired. Even if water specimens were collected on the same day, there will be differences in storage time, distribution time, water use patterns, and other factors. Therefore, the data analysis will be done using the independent t-test. Source City (n = 13) Private (n = 10) Table 1. Mercury concentrations. Mercury Concentrations (µg/L) 0.34 0.18 0.13 0.09 0.16 0.09 0.16 0.10 0.14 0.26 0.06 0.26 0.07 0.26 0.06 0.16 0.19 0.32 0.16 0.08 0.05 0.10 0.13
Extremely low limits for mercury in wastewater effluent now exist. It is often thought that whenever the concentration of heavy metals is too high, the problem can be corrected by forcing industries to stop discharging the offending substance. It is possible however, for target effluent concentrations to be so low that they might be exceeded by the concentration in domestic sewage. Specimens of drinking water were collected from two residential neighborhoods, one served by the city water supply and the other served by private wells. The observed mercury concentrations are listed below. For future studies on mercury concentrations in residential areas, it would be convenient to be able to sample in either neighborhood without having to worry about the water supply affecting the outcome. Is there any difference in the mercury content of the two residential areas? The sample collection cannot be paired. Even if water specimens were collected on the same day, there will be differences in storage time, distribution time, water use patterns, and other factors. Therefore, the data analysis will be done using the independent t-test. Source City (n = 13) Private (n = 10) Table 1. Mercury concentrations. Mercury Concentrations (µg/L) 0.34 0.18 0.13 0.09 0.16 0.09 0.16 0.10 0.14 0.26 0.06 0.26 0.07 0.26 0.06 0.16 0.19 0.32 0.16 0.08 0.05 0.10 0.13
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Extremely low limits for mercury in wastewater effluent now exist. It is often thought that
whenever the concentration of heavy metals is too high, the problem can be corrected by
forcing industries to stop discharging the offending substance. It is possible however, for target
effluent concentrations to be so low that they might be exceeded by the concentration in
domestic sewage. Specimens of drinking water were collected from two residential
neighborhoods, one served by the city water supply and the other served by private wells. The
observed mercury concentrations are listed below. For future studies on mercury
concentrations in residential areas, it would be convenient to be able to sample in either
neighborhood without having to worry about the water supply affecting the outcome. Is there
any difference in the mercury content of the two residential areas?
The sample collection cannot be paired. Even if water specimens were collected on the same
day, there will be differences in storage time, distribution time, water use patterns, and other
factors. Therefore, the data analysis will be done using the independent t-test.
Source
City (n = 13)
Private (n = 10)
Table 1. Mercury concentrations.
0.34 0.18 0.13 0.09
0.26 0.06 0.16 0.19
Mercury Concentrations (µg/L)
0.16 0.09 0.16 0.10 0.14 0.26 0.06 0.26 0.07
0.32 0.16 0.08 0.05 0.10 0.13
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