Offering time and travel expenses. If it was for free, people would be less likely to participate.
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A control variable is a variable that is held constant in a research analysis.
A treatment is imposed, ex.) making the participants take a certain medicine instead of just allowing them to do what they please and see how they heal.
The research in the field of astrophysics have the symbols and graphical representations and also the professions like statistician, numerologist ant astronomy has the symbols and graphical studies. This very interesting type of studies which requires a special kid of interest in the people who are studying it.
Case Studies Job Analyses Documentary Analysis Developmental Studies Correlational Studies Examples of this are Surveys (questionnaires, Delphi method, interviews, normative) Im only in psychology 1 but this is my most educated guess.=) hope this helped.=p
A major feature of descriptive research studies is that - quantitative representation of behavior, opinions, or phenomenon. Representative samples or entire populations so draw conclusions, specify particular characteristics they wish to study in advance of data collection