A Researcher Is Planning an Experiment to Test Whether a New

Multiple Choice

A researcher is planning an experiment to test whether a new teaching approach is helpful in improving the results of peer tutoring. Which one of the following procedures is LEAST likely to reduce the effects of confounding variables?

A) Randomly assign half of the peer tutors to implement the new teaching approach.
B) Randomly assign research assistants to assess the results of the new teaching approach.
C) Make sure the students being tutored are not aware of whether their peer tutor is using the new approach.
D) Make sure the research assistants assessing the results of the experiment don't know which student received which teaching approach.