This research is about short-term auditory effects on listening to an MP3 player. The independent variable is the output level of the MP3 player. The dependent variable is the changes in the hearing after listening to the MP3 player for one hour. The relationship between them expected was that repeatedly listening to an MP3 player could lead to hearing loss, even though the prevalence is not increasing as more media becomes available. The methodology used was experimental because the researchers exposed the participants listened to multiple sessions on two headphone sets (the researchers manipulated the independent variable). The main conclusion states that temporary changes in hearing sensitivity potentially have harmful effects, although
