When testing the effect of noise on the performance of a task, Marco tests half the participants in a cool, quiet room and the o
ther half in a hot, noisy room. In this case, what confounding variable has Marco failed to eliminate? A) Task performance
B) Noise level
C) Gender of participants
D) Room temperature
For the experiment to work and have good reliable results there should only be one variable. In this case, the variable is the noise level, and the different room temperatures would influence the experiment's results.
