STATISTICS, A branch of mathematics that deals with the collection, organization, presentation, analysis, and interpretation of data., POPULATION, It is a complete collection of all elements to be studied., SAMPLE, It is a sub-collection of elements drawn from a population., DATA, It is factual information used as a basis for reasoning, discussion, or calculation, INTERVIEW, It refers to a one-on-one conversation between an interviewer and an interviewee., QUESTIONNAIRE, A set of printed or written questions with a choice of answers., OBSERVATION, The act of watching something or someone carefully., EXPERIMENTATION, The process of performing a scientific procedure, especially in a laboratory, to determine something., REGISTRATION, It refers to the continuous, permanent, compulsory recording of data.

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