What are nonequivalent control group designs?
a quasi-experimental design in which the responses of a treatment group and a control group are compared on measures collected at the beginning and end of the research.
What is a nonequivalent control group design posttest only?
The posttest only nonequivalent control group design is used to show that a treatment was effective in a preexisting treatment group. Thos in the preexisting treatment group are compared to a control group of similar types of persons.
Why is it called Nonequivalent?
So, what does the term “nonequivalent” mean? In one sense, it just means that assignment to group was not random. In other words, the researcher did not control the assignment to groups through the mechanism of random assignment. As a result, the groups may be different prior to the study.
When using a nonequivalent groups design the researcher will assign subjects to groups by?
When using a nonequivalent-groups design the researcher will handle subject assignment to groups by: Matching subjects in the experimental group to those in the comparison group.
Which of the following accurately describes nonequivalent group design?
Which of the following accurately describes nonequivalent group design? The researcher cannot control which people go into each group and cannot ensure that the groups are equivalent. The basic threat to internal validity for a nonequivalent groups design is: Assignment bias.
Which of the following types of studies compares two nonequivalent groups one of which is exposed to the treatment and the two groups are compared?
-A quasi-experimental research design comparing two nonequivalent groups; one group is measured twice, once before treatment is administered and once after. The other group is measured at the same two times but receives no treatment.
What is the advantage of the pretest in the nonequivalent control group pretest posttest design?
What are the advantages and disadvantages of the nonequivalent control group pretest-posttest design? Advantages: Can compare scores before and after a treatment in a group that receives the treatment and in a group that does not. Disadvantages: susceptible to the threat of selection differences.
When using a nonequivalent groups quasi-experimental design the researcher will?
In nonequivalent group design, the researcher chooses existing groups that appear similar, but where only one of the groups experiences the treatment. In a true experiment with random assignment, the control and treatment groups are considered equivalent in every way other than the treatment.
What is one of the primary advantages of a pretest-posttest nonequivalent control group design in comparison?
One of the primary advantages of a pretest-posttest nonequivalent control group design, in comparison to other nonequivalent group designs, is: The pretest scores can help reduce the threat of assignment bias. In a typical pre-post study: One group is measured before and after a treatment.
Which of the following is the primary threat to internal validity for Nonequivalent Group designs?
The basic threat to internal validity for a nonequivalent groups design is: Assignment bias.
Which of the following accurately describes a nonequivalent group design?
What is a pretest-posttest control group design example?
Pretest-posttest designs grew from the simpler posttest only designs, and address some of the issues arising with assignment bias and the allocation of participants to groups. One example is education, where researchers want to monitor the effect of a new teaching method upon groups of children.
What is the advantage of the pretest in the nonequivalent control group pretest-posttest design?
What statistical test to use to compare pre and post tests?
Paired samples t-test– a statistical test of the difference between a set of paired samples, such as pre-and post-test scores. This is sometimes called the dependent samples t-test.
What statistical analysis should I use to compare pre and post tests?