84.Which statement regarding biases in demonstration studies is wrong?
(A) Volunteer effect means volunteers perform better than others
(B) Placebo effect means patients’ symptoms improve if “high tech” computers are present
(C) Hawthorne effect means subjects learn from the system, so performance improves on control cases
(D) Data completeness bias means more data are collected in computer versus control cases, so assessment is more accurate
(E) Checklist effect means performance improves if clinicians use a checklist