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. 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) operationally define his dependent variable
D) use random sampling