Table 1.

Hypothesis testing methods selection.

	Uncensored Stressor		Censored Stressor		Application
Parametric	Non- parametric	Parametric	Non- parametric
Two dependent groups	Paired t-test	Wilcoxon signed rank test	Paired MLE	Modified sign test	1) Duplicate samples (Dup) (T, D)b 2) Total and dissolved samples;
Two independent groups	Two sample t-test	Wilcoxon rank sum test	MLE	Wilcoxon rank sum test	Concentrations differences between two surface runoff sample points (T).b
Multiple independent groups	One-way ANOVAa	Kruskal Wallis test	MLE	Wilcoxon score test	1) Concentration difference among five sources (PICP, PA, PC, CC, RW) (T, D)b 2) Concentration difference among four locations for each permeable pavement (T).b

^aOVA: Analysis of variance.

^bT indicates total metal concentration; D indicates dissolved metal concentration.