ENVS 1100 Lecture 10: All Lectures 3
13 Apr 2016
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Document Summary
A plausible explanation for an observed state of nature or cause effect mechanism. Look for patterns - change independent measure dependant. If you manipulate the independent variable and the dependant variable changes much better evidence for casualty. Have to choose response variable, subject of interest experimental units, and most import ants always want randomized samples cannot be biased. Tree health is negatively affected slower near by air pollution. If this is true, then we should find that annual dress growth is coal-fired power plants vs. in pristine areas. Pseudo replication need multiple sites and manipulative places at each. The experimental units are the different forest areas the trees are subsamples. How to select the experimental units and subsamples. Only choose a bit of the actual ones tested to randomize it. In the field you pick plot locations. Manipulative: need to randomly sample the individual experimental units for inclusion in each treatment group.
