Which of the following types of bias can be reduced by by allowing equal interview time-: (A) Berkesonian bias, (B) Recall bias, (C) Selection bias, (D) Interviewer bias
Answer is D. Interviewer's bias Occur when interviewer knows the hypothesis and know who the cases are. This type of bias can be eliminated by double-blinding. (refer pgno:74 park 23 rd edition)