HARRIS COUNTY WATERSHED PROTECTION GROUP Lessons Learned on Storm Water Quality Research Projects Presented by: Trent Martin July 15, 2008
Statistical Significance – Our “Holy Grail”
POWER
Statistical Significance – Our “Holy Grail” POWER Things that affect POWER: * variability
Statistical Significance – Our “Holy Grail” POWER Things that affect POWER: * variability * level of significance
Statistical Significance – Our “Holy Grail” POWER Things that affect POWER: * variability * level of significance * size of difference between sets
Statistical Significance – Our “Holy Grail” POWER Things that affect POWER: * variability * level of significance * size of difference between sets * number of samples collected
Quality Assurance Project Plan (QAPP)
It’s OK to ask for help!
K.I.S.S. - Keep it simple. Answer one question at a time.
Any Questions? For more information: Harris County Watershed Protection Group (713) or Physical Address: 9800 Northwest Frwy., Suite 305, Houston, TX 77092