What is the most important threat to the internal validity of a study when using a non equivalent control group research design quizlet?

Def: A developmental research design that examines development by making a series of observations or measurements over time. Typically, a group of individuals who are all the same age is measured at different points in time.
-The individuals are usually cohorts, roughly the same age, who have grown up in similar circumstances.
-Several measurements of a particular variable are made in the same individuals at two or more times in their lives to investigate the relationship between age and that variable.
-nonexperimental design, specifically, a one-group pretest-post-test design
-The distinction between a longitudinal design and a time-series design is not always clear.

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What is the most important threat to internal validity?
What is the major problem with the nonequivalent control group design?
What are the three most common threats to internal validity?
What are the two major threats to internal validity?

Adv:
-the absence of cohort effects because the researcher examines one group of people over time rather than comparing groups that represent different ages and come from different generations
-a researcher can discuss how a single individual's behavior changes with age

Disadv:
-extremely time-consuming, both for the participants (it requires a big commitment to continue in the study) and the researcher (the researcher must stay interested in the research and wait for years to see the final results)
-very expensive to conduct because researchers need to track people down and persuade them, when necessary, to come back to participate in the study
-subject to high dropout rates of participants. People lose interest in the study, move away, or die

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What is the most important threat to internal validity?

Attrition bias is a threat to internal validity. In experiments, differential rates of attrition between treatment and control groups can skew results. This bias can affect the relationship between your independent and dependent variables. It can make variables appear to be correlated when they are not, or vice versa.

What is the major problem with the nonequivalent control group design?

nonequivalent groups renders a design vulnerable to all internal validity threats because it is difficult to determine whether posttest differences are attributable to a treatment effect or preexisting group differences.

What are the three most common threats to internal validity?

Threats to Internal Validity.

Attrition: Attrition is bad for your research because it leads to a bias. ... .

Confounding variables: When your research has an extra variable related to the treatment you applied to your sample group that affects your results, then that leads to confusion. ... .

Diffusion: This is a tricky one..

What are the two major threats to internal validity?

Factors which jeopardize internal validity Testing--the effects of taking a test on the outcomes of taking a second test. Instrumentation--the changes in the instrument, observers, or scorers which may produce changes in outcomes.