HD FS 229 Chapter Notes - Chapter 42-55: Apache Hadoop, Design Of Experiments, External Validity

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Variables = factors in a given situation that have no fixed/constant value. Operationally defining = specifying in measurable terms, the variables under study. Validity = how well an assessment procedure actually measures the variable under study. Reliability = the degree to which the same results will be obtained consistently if the measure is administered repeatedly or if several observers are viewing the same behavior episodes. Naturalistic approach used to explore children"s spontaneous tendencies to behave aggressively as they play: do not involve manipulation of variables; simply observation of real- world happenings. Physiological measures = shifts in heart rate, brain wave activity, or respiration rate that can indicate a child"s reaction to changes in stimuli. Research design = the overall conceptual approach that defines whether the variables will be manipulated, how many children will be studied, and the precise sequence of events as the study proceeds.

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