Which of the following is an acceptable operational definition for an auditory threshold?
a. The lowest intensity of a sound, as measured in decibels, at which a participant always reports hearing the sound
b. The lowest intensity of a sound, as measured in decibels, at which every participant in an experiment reports hearing the sound
c. The lowest intensity of a sound, as measured in decibels, at which a participant reports hearing the sound 50% of the time
d. The lowest intensity of a sound, as measured in decibels, at which 50% of the participants report hearing the sound.
C
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