1.
It is a method of gathering information from a sample of people, traditionally with the intention of generalizing the results to a larger population.
2.
It is a deliberate attempt to manipulate a situation, in order to test a hypothesis that a particular cause creates a particular effect, in other words that varying input will affect the output.
3.
It is a systematic data collection approach. Researchers use all of their senses to examine people in natural settings or naturally occurring situations.
