作者: Blaine R. Worthen , Rebecca W. Valcarce
DOI: 10.2466/PR0.1985.57.3.735
关键词:
摘要: Nonresponse is a serious threat to validity in mail surveys, prompting the need for research on techniques increasing response rates. The relative effectiveness of personalized versus form covering letters obtaining responses questionnaire survey was investigated both initial and follow-up mailings. A eliciting opinions about content college courses measurement sent 1000 Utah school teachers, randomly divided into two groups, with 500 receiving letters. Nonrespondents each group were divided, half Using nondirectional hypothesis tests, no statistically significant differences found or either These findings do not support widely held belief that improve