It would be relevant to include a histogram of #yes_answers - #no_answers in the summary, to test whether people are biased towards positive rather than negativ

It would be relevant to include a histogram of #yes_answers - #no_answers in the summary, to test whether people are biased towards positive rather than negative tests. I think the raw data suggests that it does although I totally failed to create a histogram in google spreadsheets within 5 minutes.