Researchers call random radio listeners on the phone to rank five different popular songs. this research radio stations decide which songs to play more often. this method of gathering data is classified a census. a sample survey. an experiment. an observational study.

I believe the answer is the second choice:

A Sample Survey.

Hope this helps!

Right A sample survey

During a survey the information is collected from a sample of the population, in other words:

The data collection only involves part of the total population

This means that the group selected for the research represents the whole population, as it happened with the random calls to the  radio listeners to rank five different popular songs.

If this were a census, the information would be gathered from every member of the population, this means the whole population and no sampling method would be used .

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tickets for the harlem globetrotters

show at michigan state university in

2010 cost $16, $23, or, for vip seats, $40.

total revenue = 16x + 23y + 40z

if 9 times as many $16 tickets were sold

as vip tickets,

x = 9z => x – 9z = 0, if 9 times as many $16 tickets were sold

as vip tickets,

x = 9z => x – 9z = 0, sales of all three kinds of tickets would

total $46,575.

16x + 23y + 40z = 46575, how many of each kind of ticket would

have been sold?

solve for x, y and z

x − 9z = 0

x − y − z = 55

16x + 23y + 40z = 46575

x = 1170

y = 985

z = 130

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