Dwa argumenty za opcją odpowiedzi Nie-wiem oprócz opcji Tak/Nie w anonimowych testach zrozumienia zależności przyczynowo-skutkowych

In the experiment we examined the behaviour of the participants at the two seemingly equivalent decision situations. At the first situation the participants, aimed to avoid a decisive answer, can only refuse at all, neither Yes nor No. But at the second situation they can choose an additional option I-don’t-know. It was proved that, even in the anonymous survey, the same participants tried to guess the proper Yes or No answers, signifi cantly more oft en at the fi rst situation than at the second one. Th erefore, the option I-don’t-know creates the better opportunity to obtain unbiased information. Th en, the observed relationship between the proportion of Yes versus No answers and the frequency of the I-don’t-know answers gives an additional insight into reliability of the obtained data.