Tom wants to know the average number of musical instruments students in his school play. He used the school's two band classes, consisting of a total of 48 students, as his representative sample. He concluded that students in his school play an average of three musical instruments.

Question

Is his conclusion valid?

Answer 1

No, Tom's conclusion is not valid because he only surveyed students in the school's band classes, which may not be representative of the entire student population. To get an accurate average of the number of musical instruments students play in the school, Tom should survey a random sample of students from different grades and classes, not just band classes.