Question

Carla wants to know how many students in her school enjoy watching reality TV shows. She asks all 22 students in her science class and finds that 40% of her classmates enjoy watching reality TV shows. She claims that 40% of the school's student population would be expected to enjoy watching reality TV shows. Is Carla making a valid inference about her population? 
No, it is not a valid inference because her classmates do not make up a random sample of the students in the school

No, it is not a valid inference because she asked all 22 students in her science class instead of taking a sample of the students in her school

Yes, it is a valid inference because she asked all 22 students in her science class

Yes, it is a valid inference because her classmates make up a random sample of the students in the school

Answer 1

I believe that it's no, it is not a valid inference because her classmates do not make up a random sample of the students in the school. But I can't be sure, I really haven't done much on inferences, especially in math. I know for sure that her inference is incorrect though. Hope this helps, even a bit!