Cathy has long believed that all her supervisors are cranky and disagreeable individuals. According to the confirmation bias, after being transferred to a new department, what will Cathy most likely do on her first day in the new supervisor’s department?

She will look for negative behavior from her supervisors.

Confirmation bias is when a person (unconsciously or consciously) automatically searches for information that supports their previous beliefs or knowledge. In Cathy's case, she has had a history of all of her supervisors being negative people. She will then expect her new supervisors to also be negative, falling into confirmation bias.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

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