mode - most frequent , mean - avg, median - middle number, range - diff between high and lowest scores, standard deviation - how scores vary around the mean score, correlation coefficient - stat from -1 to +1, illusory correlation - perception of a relationship where none exists, operational def - names steps and procedures that experimented used to measure varibles --allows for replication, double blind procuedure - both participants and research staff dont know if patient recived placebo or treatment, confounding varibale - factor other than the inde that might produce an affect in the experiment (external),

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