Examlex
To have text appear over a hyperlink when you hover your mouse over the link,which of the following should be done?
Experiment
A research procedure in which a variable is manipulated and the effect of the manipulation is observed.
Observational Study
A type of research in which the investigator observes and records behavior or outcomes without manipulating the study environment or subjects.
Ethical Concern
Issues or situations that require careful consideration of principles of right and wrong in making decisions.
Placebo Drug Studies
Research studies that investigate the effect of a treatment, in which some participants receive a placebo, or inert substance, to compare against the effects of actual drugs.
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