ch 10 vocab part 2

also called attrition; loss of participants who have enrolled in a study. Can occur for numerous reasons, including voluntary drop-out, relocation, or death

a type of testing effect in which the order a test is administered affects the outcome

a threat to internal validity caused by the research participant consciously or unconsciously influencing the outcome

the ability of a study to detect a difference or relationship

a type of testing effect in which exposure to the pretest affefcts the outcomes of subsequent testing

also called Rosenthal effect; occurs when the intervention leader's positive expectations for an outcome lead the participants to respond more favorably

when research participants are assigned to groups in such a way that each participant has an equal chance of being assigned to the available groups

a type of sampling in which each potential particpant has an equal chance of being selected for participation in a study

the tendency of individuals who have extreme scores on a measure to regress toward the mean when the measure is re-administered

conducting a study that duplicates most or all the features of a previous study

the number of individuals who respond to a survey divided by the number of individuals who initially received the survey

also called Pygmalion effect; occurs when the intervention leader's positive expectations for an outcome lead the participants to respond more favorably

the degree to which a sample does not represent the intended population

differences in groups that occur due to the selection process

the accuracy of the conclusions drawn from the statistical analysis of a study

changes that occur because of the test administration process

in the case of a measure, the ability of that measure to assess what it is intended to measure. In the case of a study, when the conclusions drawn are based on accurate interpretations of the study findings and not confounded by alternative explanations