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 arepresent
(C) Hawthorne effect means subjects learn from the system, so performance improveson control cases
(D) Data completeness bias means more data are collected in computer versus controlcases, so assessment is more accurate
(E) Checklist effect means performance improves if clinicians use a checklist