Abstract
Of 9 studies involving self-esteem and persuasibility following exposure to a mass communication, none made proper use of control data. This failure leaves unresolved the validity of interpretations which are reasonably alternative to that which supports the research hypothesis. Four of the studies are discussed in detail in order to exemplify the range of interpretations which may be considered alternative to those which, according to the authors, support their research hypotheses. The need for control data in this research area is discussed in the more general context of the purpose of control data.
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