Your school wants a simple random sample of 50 students from the junior class at the school. which of the following will produce the simple random sample?

The random sample is that where every result (student for the case) has the same probability to be selected.

Then you cannot use any method that select one student with preference.

Two possible valid methods are:

- Write the number of each student in separate papers, put all the papers in a closed box and  blind choose 50 papers.

- Assign a number to each student of the school and use a method to generate 50 random numbers.