Treatment FAQ

if a pretest causes a change in participants’ sensitivity to a treatment, what threat is operating?

by Dr. Cesar Wehner I Published 3 years ago Updated 2 years ago

What is the name of the threat that indicates that taking a pretest may affect performance on an posttest?

Instrumentation is another threat. This refers to possible changes in the measurement procedure (sometimes called instrumentation) from the time it was used as a pretest to the time it was used as a posttest.

What is the name of the potential problem caused by the pretest in the pretest posttest randomized control group design quizlet?

Stands for experimental treatment. What is the name of the potential problem caused by the pretest in the pretest-posttest randomized control group design? Pretest sensitization also called the reactive effect of testing.

What are the 7 threats to internal validity?

There are eight threats to internal validity: history, maturation, instrumentation, testing, selection bias, regression to the mean, social interaction and attrition.May 1, 2020

What are the four threats to validity?

History, maturation, selection, mortality and interaction of selection and the experimental variable are all threats to the internal validity of this design.

What is the name of the experiment design that has both pretest and posttest?

Randomized Control-Group Pretest Posttest Design.

The pre-test post-test control group design is also called the classic controlled experimental design. The design includes both a control and a treatment group.

What is the John Henry effect quizlet?

John Henry effect. an effect that refers to the possibility that the control group might become aware of it's "inferior" status and respond by trying to outperform the experimental group.

What are the 12 threats to internal validity?

These threats to internal validity include: ambiguous temporal precedence, selection, history, maturation, regression, attrition, testing, instrumentation, and additive and interactive threats to internal validity.

What are the 10 threats to internal validity?

Influences other than the independent variable that might explain the results of a study are called threats to internal validity. Threats to internal validity include history, maturation, attrition, testing, instrumentation, statistical regression, selection bias and diffusion of treatment.Sep 2, 2021

What is threats to internal validity?

Single group threats to internal validity refer to threats that can arise when your study treatment focuses on one group. This refers to the criticism or confusing variable that can arise when your research focuses on one sample group.Oct 6, 2021

What is a threat to validity?

From a research design standpoint, the simplest way to understand threats to validity is that a hypothesis might be tested in a manner other than what the researcher had intended—a situation not to be confused with the researcher's failure to obtain the result he or she had expected.Dec 27, 2012

What are threats to reliability?

Threats to reliability are those factors that cause (or are sources of) error. After all, the instability or inconsistency in the measurement you are using comes from such error. Some of the sources of error in your dissertation may include: researcher (or observer) error, environmental changes and participant changes.

What is a maturation threat?

Maturation. This is a threat that is internal to the individual participant. It is the possibility that mental or physical changes occur within the participants themselves that could account for the evaluation results.Oct 16, 2015

How to do quasi experimental research?

Quasi-Experimental Research. 1. Administer a pre-test to a group of individuals and record their scores. 2. Administer some treatment designed to change the score of individuals. 3. Administer a post-test to the same group of individuals and record their scores. 4. Analyze the difference between pre-test and post-test scores.

How to do a post test in a randomized controlled trial?

1. Randomly assign individuals to a treatment group or control group. 2. Administer the same pre-test to all individuals and record their scores. 3. Administer some treatment procedure to individuals in the treatment group and administer some standard procedure to individuals in the control group. 4. Administer the same post-test ...

What is a pretest post test?

A pretest-posttest design is an experiment in which measurements are taken on individuals both before and after they’re involved in some treatment. Pretest-posttest designs can be used in both experimental and quasi-experimental research and may or may not include control groups.

What is internal validity?

Internal validity refers to the extent in which a study establishes a reliable cause-and-effect relationship between a treatment and an outcome.

What is history in medical?

History – Individuals experience some event outside of the study that affects the measurements before and after a treatment.

What is the term for an individual who leaves a study before a post-measurement can be taken?

Attrition – An individual leaves the study before a post-measurement can be taken.

Can random selection minimize internal validity?

Often random selection and random assignment of individuals to groups can minimize these threats to internal validity, but not in all cases.

Quasi-Experimental Research

  • 1.Administer a pre-test to a group of individuals and record their scores. 2. Administer some treatment designed to change the score of individuals. 3. Administer a post-test to the same group of individuals and record their scores. 4. Analyze the difference between pre-test and post-test scores. Example: All students in a certain class take a pre-test. The teacher then uses a cert…
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Experimental Research

  • 1. Randomly assign individuals to a treatment group or control group. 2.Administer the same pre-test to all individuals and record their scores. 3. Administer some treatment procedure to individuals in the treatment group and administer some standard procedure to individuals in the control group. 4. Administer the same post-test to individuals in both groups. 5. Analyze the diff…
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Potential Issues with Internal Validity

  • Internal validity refers to the extent in which a study establishes a reliable cause-and-effect relationship between a treatment and an outcome. In a pretest-posttest design experiment, there are several factors that could affect internal validity, including: 1. History– Individuals experience some event outside of the study that affects the measur...
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Additional Resources

  • The following tutorials provide additional information about different types of experimental designs: Split-Plot Design: Definition & Example Matched Pairs Design: Definition & Example Cross-Lagged Panel Design: Definition & Example
See more on statology.org

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