experimental design

• Experiment - A type of research study in which the independent

  variable is manipulated by the experimenter.
• Quasi-experiments - Research method in which the experimenter either does not manipulate the independent variable or in which subjects are not randomly assigned to conditions.
• Archival research - Research that involves the use of previously

  collected data.
• Survey - a study in which a group of participants is selected from a

  population and data about or opinions from those participants are

  collected, measured, and analyzed.
• Meta-analysis - is a statistical method of reaching conclusions based on previous research.