Introduction to Design - pages 206-221
9 important questions on Introduction to Design - pages 206-221
What about internal validity?
Internal validity is the approximate truth about inferences regarding cause-effect or causal relationships.
Establishing internal validity is just a technical way of saying that you have ruled plausible alternative explanations an have thus shown that indeed a causal relationship likely exists between your program and the intended outcome.
Internal and external validity are concepts that reflect whether or not the results of a study are trustworthy and meaningful.
Internal validity refers specifically to whether an experimental treatment/condition makes a difference or not, and whether there is sufficient evidence to support the claim.
What is research enterprise?
The book concentrates most on how you learn to conduct a research project, a specific investigation of a question interest. But it is important that you understand the broader effort that each research projects contributes to.
What does translational research mean?
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What does experimental design as the ' gold standard' means?
From a theoretical perspective, they probably are the strongest of designs, but we have to be careful to understand what is meant by that .If you can implement an experimental design well , the experiment is probably the strongest design with respect to internal validitiy.
Treatment group, control group
What are the most important aspects of the research method of List?
He started a true experiment. They are being asked how much they are going to share:
4 groups
1.Baseline (control group)
2.Experiment group 2 : Take 1 (you can take and you can share )
3.Experiment group 3: Take 5
4.Experiment group 4: Take 5 + earnings (he need to do stupid work for 30 minutes and get money he knows that someone in the other room do the same)
What about external validity?
While internal validity relates to how well a study is conducted (its structure), external validity relates to how applicable the findings are to the real world.
Can you generalize it to a different situation? The degree to which the conclusions in your study would hold for other places and at other times.
What about construct validity?
The degree to which inferences can be legitimately be made from the operationalization in your study to the theoretical constructs on which those operationalizations are based.
List his theoretical construct = social norms. You need to have a measurement in real life. His action sets according are about social norms.
Experiments conducted in a lab have certain strengths and weaknesses. Illustrate these with List's experiment (2007) and use the criteria internal validity, construct validity and external validity described on page 28 of the book.
High on internal validity because it’s a true experiment conducted in the lab.
-External validity
List is proving al former experiments are wrong. This his study is low on external validity. Are the results like this because of the students?
-Construct validity
List his construct is about social norms. Criticism on construct validity = Is there realy an room b?
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