Evaluation of Septic Tank and Subsurface Wetland for
Evaluation of Septic Tank and Subsurface Wetland for
Evaluation of Septic Tank and Subsurface Wetland for
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Appendix 2 - Outlier Data Rejection<br />
RT3 NO3 RT2 TSS<br />
(mg/l) (mg/l)<br />
Sep 21 1 373<br />
Sep 21 0.2 -<br />
Oct 5 6.7 6<br />
Nov 2 0.2 13<br />
Nov 16 1 6<br />
Nov 16 - 3<br />
Dec 7 0.5 4<br />
Dec 7 0.3 -<br />
X high 6.7 373<br />
X bar (mean) 1.4142857 67.5<br />
X low 0.2 3<br />
std dev 2.356147 149.7047<br />
T = (Xhigh -Xbar)/std dev 2.2433721 2.040684<br />
T = (Xbar-Xlow)/std dev 0.5153693 0.430848<br />
<strong>for</strong> n = 7 <strong>for</strong> n = 6<br />
T values from St<strong>and</strong>ard Methods T = 2.10 T = 1.94<br />
Table 1010: I (APHA: 1998)<br />
The October 5 data <strong>for</strong> Retrieve wetl<strong>and</strong> effluent nitrate (RT3 NO3) <strong>and</strong> September 21<br />
data <strong>for</strong> Retrieve wetl<strong>and</strong> influent TSS (RT2 TSS) were rejected as outliers because the T<br />
value <strong>of</strong> the data exceeded 1% <strong>of</strong> normal sample discordancy T values according to Table<br />
1010: I in St<strong>and</strong>ard Methods text.<br />
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