Dr Mentor Is Conducting an Experiment Examining the Effects of Cell

Multiple Choice

Dr. Mentor is conducting an experiment examining the effects of cell phone conversations on reaction times while driving a car. Each participant, either conversing on a cell phone or not, manoeuvres a driving course on a simulator. This simulated drive is videotaped. The research assistant hired to do the coding of the video tapes does not
Believe cell phone use should be banned while driving a motor vehicle and tends to err in the coding of the reaction times in a way that favours this belief. This experimenter
Expectancy effect could be controlled by:

A) the placebo effect
B) improved external validity
C) counterbalancing
D) the double-blind procedure