The data were collected by means of questionnaires are available only to the target demographic that read and write only
to information restricted to the absolutely necessary, because the data were collected by means of questionnaires will need to have a few questions as possible. It is possible, if respondents did not understand the question or understand the questions wrong. Answer some questions Or brash, before answering questions. It makes the data are inaccurate. The researchers can not go back to ask for another sample that researchers should take into consideration that query reconsider. Time to find bugs that must be modified. Experts have reviewed the questionnaires and should provide them with in order to take suggestions and criticisms of experts to improve even further.
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