Question

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

a census.
a sample survey.
an experiment.
an observational study.

Explanation:

Analyze the data collection method

Using the Statistical Study Types knowledge point
The scenario describes researchers calling a random subset of radio listeners to ask them to rank five popular songs. This involves selecting a subset (sample) of the entire population (all radio listeners) and asking them questions to gather data.

Evaluate the options

Using the Census Study, Experimental Study, and Observational Study knowledge points

• A census: This requires gathering data from every single member of the population, which is not the case here.
• An experiment: This requires imposing a treatment on subjects to observe its effects, which is not happening here.
• An observational study: This involves observing subjects in their natural state without direct questioning or intervention to measure specific variables.
• A sample survey: This is a study that obtains data from a subset of a population (a sample) to estimate population attributes, typically using questionnaires or interviews (such as phone calls asking for rankings). Calling random listeners to rank songs fits this definition perfectly.

Answer:

• a census.
• a sample survey. (Correct answer)
• an experiment.
• an observational study.