a 4-factor , 16-cell experimental design was used to investigate the relationship between response rates of community hospitals to a survey conducted by the american hospital association ( aha ) and 4 characteristics of the survey instrument , each varied dichotomously : the perceived length of the questionnaire , the order of questions , the orientation of the appeal made in the cover letter , and the presence or absence of a promise to share the results of the study with respondents .
C1521970
characteristics
C1444754
length