An audiologist wanted to investigate whether the frequency of an auditory cue affects human reaction time.
In the initial stage of the experiment, a group of participants wore identical headphones and pressed a handheld button as soon as they heard a low-frequency tone (150 Hz) played at a random interval.
Describe how the audiologist could design the next stage of the investigation to compare these reaction times to those when responding to a high-frequency tone (12,000 Hz12,000\text{ Hz}12,000 Hz).