An internet company conducts a global consumer survey to multinational companies understand different consumer attitudes throughout the world. within 30 countries, the researchers interview 1000 people aged 13-65. their samples are designed so that they get 500 males and 500 females in each country. complete parts a and b below. a) are they using a simple random sample?

it has to be a.

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!