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### 12 Cards in this Set

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 What is different in an experiment and a correlational study in terms of how we examine the relationship? In experiments the researcher computes the mean of the dependent scores(Yscores) for each condition of the independent variable (each X score); in correlational studies the researcher examines the relationship over all X-Y pairs simultaneously by computing a correlation coefficient. What is a scatterplot? A graph of the individual data points formed from a set of X-Y pairs. What is the regression line? The summary straight line that best fits through the scatterplot. Define a positive linear relationship. As the X scores increase, the Y scores tend to increase. Define a negative linear relationship. As the X score is increase, the Y scores tend to decrease. Define a curvilinear relationship. As the X scores increase, the Y scores do not intend to only increase or only decrease. What is concurrent validity? The extent to which the procedure correlates with an individual's present behavior. What is convergent validity? The extent to which the scores obtained from one procedure are positively correlated with scores obtained from another procedure that is already accepted as valid. What is correlation coefficient? A statistic or number that describes the important characteristics of a relationship. What is criterion validity? What are the two sub-types of criterion validity? The extent to which a procedure correlates with a behavior. Concurrent validity and predictive validity. What is a curvilinear relationship? As the X scores change, the Y scores do not tend to only increase or only decrease. What is discriminant validity? The extent to which scores obtained from one procedure are not correlated with scores from another procedure that measures other variables or constructs.