Nitrate Sample Clauses

Nitrate. Nitrate values for Tanyard Creek showed a normal distribution of data, Peavine Creek showed a skewed right distribution of data, and Stone Mountain did not show a distribution in data because all 36 points were adjusted to 0.1 ppm NO3-N (Appendix A: Figure 12 and Figure 17). For Tanyard Creek a normal distribution of data indicated that nitrate levels were approximately evenly distributed throughout the sites and that the majority of the nitrate levels fall within one standard deviation of the mean. For Peavine Creek the skewed left distribution of the data indicates that a greater portion of the samples had higher nitrate concentrations than lower nitrate concentrations. This observation is surprising because the mean value for nitrate at Peavine creek, 0.912 ppm NO3-N, is lower than the mean value for nitrate at Tanyard Creek, 0.994 ppm NO3-N, and both creeks do not show any large outliers that would cause an increase of the average values. The Wilcoxon Rank Sum test for nitrate shows a statistically significant difference in nitrate levels between Stone Mountain Creek and Tanyard Creek (p< 0.0001) and Stone Mountain Creek and Peavine Creek (p<0.0001), but not between Tanyard Creek and Peavine Creek (p>0.4901). The differences between Tanyard Creek and Stone Mountain Creek, and Peavine Creek and Stone Mountain Creek can be attributed to the adjustment of all nitrate values in Stone Mountain causing there to be no range in distribution, where as a range in values exists in the other creeks which drove the median value to not be close to 0.10 ppm NO3-N. The increase level of nitrate in Tanyard Creek and Peavine Creek is expected due to the runoff from the nearby urban centers that constitute a majority of the land use (Xxxxx, 2000). Copper Copper values for Tanyard Creek and Peavine Creek plotted a skewed left distribution in their histograms, indicating that values were more concentrated on the lower end of the spectrum, while Stone Mountain Creek did not show a distribution due to all 36 points being adjusted to 0.25 ppm Cu (Appendix A: Figure 13 and Figure 18). This is expected given that 209 of the 226 tests were adjusted: 89 out of 94 samples were adjusted in Tanyard, 84 out of 96 had to be adjusted in Peavine, and 36 out of 36 had to be adjusted for Stone Mountain. Statistically significant differences in copper levels were assessed by the Wilcoxon Rank Sum test. The Wilcoxon Rank Sum test for copper does not show a statistically significant differen...
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