Davis, J. A. (1971). Elementary survey analysis. Englewood, NJ: Prentice Hall Extension Service (1988). Cooperative extension svstem national initiatives. Focus on issues Washington, DC: United States Department of Agriculture. . . Fedele, S. V. (1985). Be potential of interactive video for extension information &livery (ASEA Technical Report 855015).
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Bruening et al. (1992) studied this question.
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