Question

Which example would be likely to give a valid conclusion?

Five students are surveyed about their favorite sport.

People are asked, "Is our great principal doing a good job?"

Thirty students are randomly sampled about their hair color.

Four boys are asked about their favorite sport.

Answer 1

Thirty students are randomly sampled about their hair color. 

This is for two reasons,. Firstly, randomness is very important in drawing conclusions. Secondly, it is less of an opinion question and more fact based. 

Answer 2

Thirty students are randomly sampled about their hair color.