Two Group Experimental Design PP1234
Summary
TLDRThis script delves into the two-group experimental design, a method to test the impact of a variable on two distinct groups: a control and a treatment group. It explains two fundamental designs: the pretest-posttest control group design, where subjects are randomly assigned and knowledge is measured before and after an educational intervention, and the post-test-only control group design, which omits the pretest. Both aim to quantify the effect of the intervention on knowledge, such as an educational video on influenza, by comparing post-test scores.
Takeaways
- 🔬 Two group experimental design is a method used to test the effects of a variable on two different groups: a control group and a treatment group.
- 📚 The purpose of this design is to measure the effect of an independent variable that can be manipulated, such as an educational intervention.
- 🎥 An example given is an educational video on influenza to test its impact on knowledge about the subject.
- 🔄 There are two basic designs within two group experiments: pretest-post-test control group design and post-test only control group design.
- 🔄💉 In the pretest-post-test control group design, subjects are randomly assigned to either group and given a pretest before the treatment.
- 📉 The treatment group receives the educational intervention, and then both groups are retested to measure changes in the dependent variable.
- ⚖️ The effect of the treatment is determined by comparing the difference in post-test and pretest scores between the control and treatment groups.
- 📊 The post-test only control group design omits the pretest, focusing solely on the post-test results to evaluate the treatment's effect.
- 📈 The effectiveness of the educational session is calculated by subtracting the control group's post-test scores from the treatment group's scores.
- 📝 Random assignment is crucial in these designs to ensure that the groups are comparable and the treatment effect can be accurately measured.
- 🔑 The dependent variable of interest in the script's example is knowledge about influenza, which is measured before and after the educational intervention.
Q & A
What is a two-group experimental design?
-A two-group experimental design is a simple and true experimental design that tests the effects of a variable on two different groups: a control group and a treatment group. It measures the effect of an independent variable that can be manipulated as a treatment.
What is the purpose of an educational video on influenza in this experimental design?
-The educational video on influenza serves as the treatment in the experimental design, aiming to improve the participants' knowledge on influenza.
What are the two basic designs within two-group experiments mentioned in the script?
-The two basic designs within two-group experiments are the pretest-post-test control group design and the post-test-only control group design.
How are subjects assigned in the pretest-post-test control group design?
-In the pretest-post-test control group design, subjects are randomly assigned to either the control group or the treatment group.
What is measured in the pretest and post-test in the pretest-post-test control group design?
-In the pretest-post-test control group design, the dependent variable of interest, in this case, knowledge, is measured before and after the treatment.
What is the treatment given to the treatment group in this experimental design?
-The treatment given to the treatment group is the educational video on influenza.
How does the pretest-post-test design measure the effect of the treatment?
-The pretest-post-test design measures the effect of the treatment by comparing the difference in post-test and pretest scores between the control and treatment groups.
What is the main difference between the pretest-post-test control group design and the post-test-only control group design?
-The main difference is that the pretest-post-test control group design includes a pretest, while the post-test-only control group design does not.
How is the effect of the treatment calculated in the post-test-only control group design?
-In the post-test-only control group design, the effect of the treatment is calculated by subtracting the post-test results of the control group from the post-test results of the treatment group.
What does the comparison of post-test scores between the control and treatment groups indicate?
-The comparison of post-test scores between the control and treatment groups indicates the effect of the educational session on influenza knowledge.
Why is random assignment important in experimental designs?
-Random assignment is important in experimental designs to ensure that the groups are similar before the treatment is applied, thus reducing the likelihood of bias and increasing the validity of the results.
Outlines
🔬 Introduction to Two-Group Experimental Design
The paragraph introduces the concept of a two-group experimental design, which is a method used to test the effects of a variable on two distinct groups: a control group and a treatment group. The paragraph explains the purpose of this design, which is to measure the impact of an independent variable, such as an educational video on influenza, on a dependent variable, such as knowledge about influenza. The paragraph also distinguishes between two types of two-group experimental designs: the pretest-post-test control group design and the post-test-only control group design, providing a brief overview of how each design operates and the significance of their respective outcomes.
Mindmap
Keywords
💡Two Group Experimental Design
💡Control Group
💡Treatment Group
💡Independent Variable
💡Dependent Variable
💡Pretest-Posttest Control Group Design
💡Post-Test Only Control Group Design
💡Random Assignment
💡Effect Size
💡Educational Video
💡Influenza Knowledge
Highlights
Two group experimental design is a simple and true experimental design that tests the effects of a variable on two different groups - a control group and a treatment group.
The design measures the effect of an independent variable that can be manipulated as a treatment, such as an educational video on influenza.
There are two basic designs within two group experiments: the pretest post-test control group design and the post-test only control group design.
In the pretest post-test control group design, subjects are randomly assigned to either the control or treatment group and given a pretest to measure their knowledge.
The treatment group receives the educational video on influenza after the pretest.
Both the control and treatment groups are retested after the treatment to measure the effect on their knowledge.
The effect of the pretest post-test design is measured by the difference in post-test and pretest scores between each group.
The post-test only control group design is similar to the pretest post-test design, but without a pretest.
The effect of the post-test only design is determined by subtracting the post-test results of the control group from the treatment group.
The purpose of the educational video on influenza is to improve knowledge on the subject.
Random assignment of subjects to groups helps ensure the validity of the experimental design.
The pretest serves as a baseline measure of knowledge before the treatment is applied.
The post-test measures any changes in knowledge after the treatment has been administered.
Comparing post-test and pretest scores allows for the evaluation of the treatment's effectiveness.
The difference in scores between the control and treatment groups indicates the impact of the educational video.
The post-test only design simplifies the experimental process by eliminating the pretest.
The effectiveness of the educational video is determined by comparing the post-test scores of both groups.
The two group experimental design provides a clear method for evaluating the impact of educational interventions on knowledge acquisition.
Transcripts
I look at two group experimental design
by Amy Janice and Christine so it is to
group experimental design it's a simple
and true experimental design that tests
the effects of a variable on two
different groups a control group and a
treatment group it measures the effect
of an independent variable that can be
manipulated as a treatment for example
will an educational video on influenza
improve your knowledge on influenza
before we get too far ahead of ourselves
let's just take a look at the two basic
designs within two group experiments
there's the pretest post-test control
group design and the post-test only
controlled group design but what does
that mean with the pretest post-test
control group design subjects are
randomly assigned to either the control
group or the treatment group each group
is given a pretest to measure their
dependent variable of interest in this
case we're looking at knowledge the
treatment group also receives the same
pretest now the treatment group receives
the treatment or it the educational
video on influenza then both groups are
retested on that dependent variable the
effect of the pretest post-test design
is measuring the difference in the
post-test and pretest scores between
each group take our control group
subtract their post-test scores from
their pretest scores to get a value do
the same for the treatment group so by
subtracting the treatment scores from
the control group scores we figured
about the effect
overtreatment the effect of our
educational session on influenza
knowledge the post-test only control
group is very similar to the pretest
post-test except they don't have a
pretest the effect of the post-test only
design is the post-test results of the
treatment group - the post-test results
of the control group give us the effect
of that education on the knowledge
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