Dr. Gillis has decided to use ____ in his research to guard against both experimenter bias and participant expectations.
a. confounds
b. random selection
c. the placebo effect
d. the double-blind design
Question 2
The school psychologist at Happy Elementary School conducts a study where the students of one fourth-grade class are given five recesses during the day, while students in the other class are allowed the standard two recesses. The psychologist explains to the teachers that more breaks should lead to better behavior in the classrooms and then has the teachers observe the children's progress. In this experiment, there is the risk of ____.
a. random sampling
b. experimenter bias
c. participant bias
d. the placebo effect
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