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Unformatted text preview: Tests must be reliable and valid. Researchers use experiments to collect information about causal relationships between variables. In experiments, researchers include experimental and control groups . Bias is the distortion of results by a variable . Types of bias include sampling bias , subject bias , and experimenter bias . Ethical Considerations Psychologists must consider ethical norms when doing research involving humans or animals. Interpreting Data Researchers analyze and interpret the data theyve collected by using descriptive statistics and organizing their information in histograms or bar graphs . Researchers use inferential statistics to determine the likelihood that a result is due simply to chance. Statistical significance means that a result is probably not due to chance....
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- Winter '09