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The first one is an extremely readable introduction to the fundamental concepts of quantitative research, including an in-depth look at statistical variables, research planning, questionnaire design, data collection and ethics.
The question of the deterrent effect of capital punishment has not been conclusively answered; the many statistical variables may make a final conclusion impossible.
RJG notes that the system can calculate CPK, PPK, and other statistical variables. It works with current and historical summary file formats, the company adds.

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