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### 15 Cards in this Set

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 control group the condition of an experiment that contrasts with the experimental condition and serves as a comparison for evaluating the effect of the treatment correlation coefficient statistical measure of a relationship; reveals how closely they vary hindsight bias the tendency to believe, after learning an outcome, that one would have foreseen it. descriptive statistics used to describe the basic features of the data in a study inferential statistics provide ways of testing the reliability of the findings of a study and "inferring" characteristics from a small group of participants or people (your sample) onto much larger groups of people (the population) mean A measure of central tendency which is more commonly known as an "average" median A measure of central tendency that is defined as the midpoint in an array of numbers mode A measure of central tendency which is defined by the most common number in an array independant variable the experimental factor that is manipulated; the variable whose effect is being studied dependent variable the outcome factor; the variable that may change in response to manupilations of the independent variable range the difference between the highest and lowest scores in a distribution standard deviation a computed measure of how much scores vary around the mean score operational deviation a statement of the procedures (operations) used to define research variables scatter plot a graph cluster of dots, each of which represents the values of 2 variables. The slope of the points suggests the direction of the relationship between the 2 variables. The amount of scatter suggests the strength of the correlation. hypothesis a testable prediction, often implied by a theory