To compare the hearing capacities of 5 of his friends, Ravi designs a simple experiment. He places a CD player at the end of a long hall containing a CD with 5 well-known songs.
One by one each person hears the same 5 songs he plays softly but at a pre-determined volume.
Each person starts at a distance of 1 metre from the player and moves away from it. The distance at which a person says that he cannot hear the song any more, is noted. Others are not in the room when 1 person is hearing the songs.
Which of these steps may increase the reliability of the results obtained?
A) having each person listen to just 1 song instead of 5
B) allowing all people to stay in the room for the entire experiment
C) having each person start from far and walk towards the C
D) player Dvarying the volume for the different songs being played
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