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This work aims to investigate whether individuals, in decision-making in situations at risk, make choices consistent with the prospect theory, seeking to evidence occurrences of certainty, reflection, and isolation effects. For that, a questionnaire was applied, used in the original work by Kahneman and Tversky (1979) and adapted by Faveri et al. (2013), in 73 students of the Accounting Sciences undergraduate course at the Federal University of Juiz de Fora. This questionnaire took place in two moments, the first without knowledge and discussion about the theory of expected utility and, in the second moment, after explaining the concept of expected value. In addition to the analysis of the questions regarding the certainty, reflection, and isolation effects of PD, the originality of the study consists of comparing the results obtained in this research with the results presented in the article by Faveri et al. (2013), which inspired this work. A comparative analysis was also carried out, in a general scope, of the results obtained in the following moment (second application) to the present research, with the results of other selected researches, so that, finally, an analysis was carried out from the perspective of the genre. As the results show, the sample of this work has evidence of the presence of the same biases found by Kahneman and Tversky (1979) and by other empirical studies, strengthening the inferences that behavioral aspects can influence the choices of individuals. [ABSTRACT FROM AUTHOR]