Proceedings - Teaching and Learning Centre - Simon Fraser ...
Proceedings - Teaching and Learning Centre - Simon Fraser ...
Proceedings - Teaching and Learning Centre - Simon Fraser ...
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<strong>Fraser</strong> River Action Plan 3rd Research Workshop<br />
Median concentration differences <strong>and</strong> significance of ranked t-test for comparison of 1993<br />
versus 1973 metal concentrations in streambed sediment (n=32)<br />
Element Digestion<br />
Method<br />
Mn total<br />
extractable<br />
Pb total<br />
extractable<br />
Cu total<br />
extractable<br />
Zn total<br />
extractable<br />
Ni total<br />
extractable<br />
Median percent<br />
difference, 1993<br />
minus 1973 concentrations<br />
131<br />
2,600<br />
Page 146<br />
-35<br />
-16<br />
81<br />
49<br />
45<br />
33<br />
-7<br />
n.c.<br />
Hg total 294<br />
Cd total<br />
extractable<br />
Fe total<br />
extractable<br />
p Value*<br />
Silt <strong>and</strong> Clay 92 0.00<br />
n.c.<br />
n.c.<br />
-21<br />
-19<br />
0.00<br />
0.00<br />
0.04<br />
0.05<br />
0.01<br />
0.01<br />
0.00<br />
0.10<br />
0.56<br />
0.02<br />
0.20<br />
LOI 10 0.27<br />
* - p values indicate the probability that the means are identical<br />
n.c. - no comparison made because of high 1993 detection limit
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