BIOL 143 Chapter Notes - Chapter 6: Facilitated Communication, Experiment, Dependent And Independent Variables
20 Mar 2017
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When a variable is isolated results will eliminate other alternative theories. Ensures that there will be no systematic bias in how the subjects are assigned to the groups. Chapter 6: getting things under control: the case of clever hans. John snow hypothesized that cholera was spread by water supply, which was contaminated with the excrement of victims. Scientific thinking is based on the ideas of comparison, control, and manipulation. By comparing results from different, but controlled, conditions, scientists rule out explanations and confirm others. The goal of experimental design = isolate a variable. Scientists need to restructure the world in ways that will differentiate alternative hypotheses must manipulate the variable and observe whether a differential effect occurs while they keep all other relevant variables constant. Random assignment: the subjects do not determine which experimental condition they will be in; they are randomly assigned to one of the groups any conclusions about the cause.
