Chapter 20. Experiments 1. Under what conditions is experimental research most appropriate? Show
2. What can you do with experiments that you cannot do with other approaches to research?
3. Why are control groups used in experiments? What do they do for you?
4. Why is random assignment to groups used in experiments? What does it do for you?
5. What are the main strengths and weaknesses of experiments?
6. Compare the two-group pretest-posttest design to the two-group posttest only design. What additional information does the pretest give you in the former? What potential sources of invalidity does the pretest allow you to rule out?
7. Compare the Solomon four-group design to the two-group pretest-posttest design. What additional information do the additional groups give you in the former? What potential sources of invalidity do they allow you to rule out?
8. How can you determine whether the pretest is influencing the way people respond to the experimental stimulus?
9. How can you determine whether the pretest is influencing the way people respond to the posttest?
10. How can you check the validity of the random assignment to conditions?
What is the difference between experimental group and control group?What is the difference between a control group and an experimental group? An experimental group, also known as a treatment group, receives the treatment whose effect researchers wish to study, whereas a control group does not. They should be identical in all other ways.
Is the experimental group the dependent variable?An experimental group in a scientific experiment is the group on which the experimental procedure is performed. The independent variable is changed for the group and the response or change in the dependent variable is recorded.
How many differences should there be between your control group and experimental group?1. What is the difference between a control group and an experimental group? Put simply, an experimental group is the group that receives the variable, or treatment, that the researchers are testing whereas the control group does not. These two groups should be identical in all other aspects.
How do experimental and control groups differ explain with the help of an example?Experimental groups differ from control groups as independent variable manipulation occurs in an experimental group whereas it is absent in a control group. For example, in a study conducted by Latane and Darley, there were two experimental groups and one control group.
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