What is the first thing does the researcher need to do with the data if he wants to conclude that the program improved their interview skills.
A. create a difference score as Xpostprogram- Xpreprogram
B. create a difference score as Xpreprogram- Xpostprogram
C. create a difference score where half of the sample is calculated as Xpostprogram- Xpreprogram and other half as Xpreprogram- Xpostprogram to minimize the condition effect
D. create an average of the preprogram and postprogram scores
Answer: A
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