This study says that AI influences human decisions, and I think to say that the study needs a control group, with the same setup but with "AI" replaced by a hum

This study says that AI influences human decisions, and I think to say that the study needs a control group, with the same setup but with "AI" replaced by a human, who would toss a coin to choose his opinion. The participants of the control group should be made aware of this strategy. Comparing with such a group we could meaningfully talk about AI influence or "trust in AI", if the results were different. But I'm really not sure that they would be different, because there is a hypothesis that people just reluctant to take the responsibility for their answer, so they happy to shift the responsibility to any other entity. If this hypothesis true, then there is a prediction: add some motivation, like pay people $1 for each right answer, and the influence of opinions of others will become lower.