If I give a task in which there are only two response-options, and I want to categorise the participant according to their responses, what is the 'cutoff' or required proportion of one type of response?E.g.50-50 would be chance level performance: 50% Type A responses; 50% Type B responses.100-0 would be a perfect Type A performance: 100% Type A responses.Presumably a significant number of Type A responses (say, probably around 65%) would qualify as 'Type A' as opposed to 'chance performance'. But how should I decide on what that number is - what is a justifiable criterion and how do I justify using it?
In a forced-choice task, what proportion of responses is above chance level?
statistics