Random sampling, need some help and guides

Question

i was asked to do an assignment on examining the Body Mass index of students. I have to select at least 50 students from my school, and i was asked to describe how I ensure the randomness of the sample. Can anyone explain to me how can i ensure the randomness of my samples?

Answer 1

Ideally you would put all the students in your school into a numbered list ($1, 2, ..., N$). Then, using a random number generator (or a list of random numbers), you would pick $50$ random numbers from $1$ to $N$, and use the corresponding students on the list for your sample.