The unique characteristic of postal administration is that the researcher has no contact with the respondent except for a cover letter he/she has written to accompany the questionnaire. In addition, mailed questionnaires are often in competition for the addressee's attention with various sorts of circulars, catalogues, and junk mail also received through mail, and the two factors together largely explain why the return rate of such surveys is often well below 30%. Such a low return rate, of course, undermines the reliability of the sample (cf. Section 3.1.3) and therefore if we decide to conduct a survey by mail we need to adopt a number of special strategies that have been found to increase the respondents' willingness to complete and return the questionnaire.
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100 Cover Letter Tips EVERY Single Person Should Know. In applying for a job, you need to know what a cover letter is so that you would be able to recognize its importance. The cover letter is actually the same as the letter of application, letter of intro duction, as well as a transmittal letter. It is a letter that should always accompany the applicant’s resume, since not too many employers would consider an application without it.