The most concerning source of bias in this scenario is: Biased results.
If the employee are asked to raise up their hands so as to indicate whether they are happy most of the employee will not likely raise their hands.
The reason why they would not likely raise their hands is because the employee would not want to express their unhappiness in the presence of their supervisors.
Based on this, their is tendency that that plan is likely to have biased results.
Inconclusion the most concerning source of bias in this scenario is: Biased results.
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