Researchers call random radio listeners on the phone to rank five different popular songs. This research helps radio stations decide which songs to play more often. This method of gathering data is classified as

The researchers ask a group of listeners to give their opinions about five songs, so they are collecting information through a survey. Because they contact only some listeners rather than every radio listener, it is a sample survey. It is not an experiment, since the researchers do not assign listeners to treatments or change what they hear.

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