Question

Two ad agencies want to understand issues that are important to students. Agency A will interview 50 students whose names are randomly chosen from school enrollment data. Agency B will interview 50 randomly selected people from those who respond to a social media posting. Which method will produce a fair sample of the student population and why?

Agency A, because students are convenient and easy to interview
Agency A, because names randomly selected from school data will be student names
Agency B, because people who respond to social media postings have strong opinions

Answer 1

Agency B, because people who respond to social media postings are usually students
I think it's either A or B

Answer 2

@SolomonZelman @Directrix @ganeshie8

Answer 3

yeah, I was thinking A also, because you want to "survey" all of the enrolled students, and therefore must choose out of those. Not to just choose out of those who responded to the social media posting.

Answer 4

I mean thinking of the Agency A.

Answer 5

but will they be necessarily easy and convenient to interview, (if they haven't responded to the social media posting, which can be showing that they are a bit not social) ?

Answer 6

no it wont

Answer 7

so it's more of A

Answer 8

retry....

Answer 9

B?

Answer 10

Yes.

Answer 11

oh wow thanks :)

Answer 12

The reason is, that you want to know about all of the students in a school, not just the ones who responded to the Social Media Posting.

And then, it is not A, because the reason in choice A is probably the opposite.

Answer 13

you welcome!