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basic principles of experimental research
EXPERlMENTAL lNTERNAL VALlDlTY
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aggressive anxiety assess behavioral research bias causal Chapter child consider control group correlational variable demand characteristics dependent measure dependent variable detect determine drug employed error variance evaluate example experiment experimental effects experimental internal experimental manipulation experimenter bias external validity factor analysis Figure frequency groups of subjects havior illustrate increase individual influence inter-rater reliability interaction interested internal invalidity interview investigator involves learning Liebert ln contrast matching means ment method mixed design nonprobability sampling null hypothesis observation obtained occur particular patients performance population possible prediction presented pretest probability problem procedure produced questionnaire random assignment randomly raters rats relationship reliability repeated measures responses reward Rosenthal sample schizophrenic scientific scores selected selection bias self-injurious sensory deprivation sensory threshold single-subject situation Social Psychology sources of internal Suppose technique television theoretical third variable tion