Question

You want to determine the number of students in your school who have visited a science museum. You survey 50 student at random. 20 have visited a science museum, and 30 have not. So, you conclude that 40% of the students in your school have visited a science museum. Is your conclusion valid? Explain.

Answer 1

No it is not valid because you only asked 50 students not every student so it could not be 40%.