| Sumario: | The article presents a study concerning the sampling errors involved in the incomplete returns of mail questionnaires in the U.S. The author focuses on a survey about the employment status of the 327 technology and chemistry majors who graduated from the College of the City of New York in 1936. Questionnaires, each attached by a stamped return envelope, were distributed by mail to these alumni in June 1939. It was found out that more successful alumni had responded giving a falsified picture of the situation. Given this experience, it is stated that the early incomplete returns of the questionnaires implied a serious sampling errors.
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