1.Q: what are the three major components in the classical experiment?
A: Independent & Dependent variables
Pretesting & posttesting
Experimental & control groups
2.Why we in favor of randomization than matching in selection subject ?(p.227)
A: a.You may not be in a position to know in advance which variable will be
relevant for the matching process.
b.most of the statistics used to analyze the results of experiments assume
randomization.
3.Q: List five factors that may threaten internal validity.
A: (list 5 of the following)
history, maturation, testing, instrumentation, statistical regression,
selection biases, experimental mortality, causal time-order,
diffusion or imitation of treatments, compensation,
compensatory rivalry, and demoralization.
4.What is external invalidity?(p.233)
Ans: The possibility that conclusions drawn from experimental results
may not be generalizable to the “real” world.
5.Write down the strength & weakness when applied experimental method?
Answer:
1. Advantage:
-Isolation of experimental variable in time.
-Replication of the same method is easier.
2. Weakness:
-Artificial, external validity is weak, it is hard to apply the result
found in the research in real world.
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