Examlex
When using more modern overheads, lighting is still a big problem.
Survey Study
A research method involving the collection of data from a predetermined population or group by means of a questionnaire or interview.
Manipulates Factors
The adjustment or control of variables or conditions in a study or experiment to examine their effects on an outcome.
Research Method
A systematic approach to collecting data and performing scientific investigations to expand and refine knowledge in a particular field.
Random Sample
A subset of individuals chosen from a larger set, where each member has an equal chance of being selected to represent the whole.
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