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  2. Survey data collection - Wikipedia

    en.wikipedia.org/wiki/Survey_data_collection

    The survey, form, app or collection tool is on a mobile device such as a smart phone or a tablet. These devices offer innovative ways to gather data, and eliminate the laborious "data entry" (of paper form data into a computer), which delays data analysis and understanding. By eliminating paper, mobile data collection can also dramatically ...

  3. Survey sampling - Wikipedia

    en.wikipedia.org/wiki/Survey_sampling

    The purpose of sampling is to reduce the cost and/or the amount of work that it would take to survey the entire target population. A survey that measures the entire target population is called a census. A sample refers to a group or section of a population from which information is to be obtained. Survey samples can be broadly divided into two ...

  4. Computer-assisted survey information collection - Wikipedia

    en.wikipedia.org/wiki/Computer-assisted_survey...

    The most common modes of computer-assisted survey information collection, ranked by the extent of interviewer involvement, are: CATI (Computer-assisted telephone interviewing) is the initial CASIC mode where a remotely present interviewer calls respondents by phone and enters the answers into a computerized questionnaire.

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  6. Participation bias - Wikipedia

    en.wikipedia.org/wiki/Participation_bias

    Participation bias or non-response bias is a phenomenon in which the results of elections, studies, polls, etc. become non-representative because the participants disproportionately possess certain traits which affect the outcome. These traits mean the sample is systematically different from the target population, potentially resulting in ...

  7. Product sample - Wikipedia

    en.wikipedia.org/wiki/Product_sample

    A free sample or "freebie" is a portion of food or other product (for example beauty products) given to consumers in shopping malls, supermarkets, retail stores, or through other channels (such as via the Internet). [1] Sometimes samples of non-perishable items are included in direct marketing mailings. The purpose of a free sample is to ...

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