A Researcher Is Concerned That His Expectations About the Effectiveness

Multiple Choice

A researcher is concerned that his expectations about the effectiveness of a new drug are influencing the reports of participants in his studies. Specifically, he believes that this new drug is effective and has shared this information with participants in his research. Now he is wondering if this might be affecting people. In order to better control the effect of his own expectations on participants, this researcher should

A) operationally define his independent variable
B) use the double-blind procedure
C) collect unobtrusive measures of participant improvement
D) use random sampling