You want a sample that represents all the students at your high school. For each of the following, determine if the method used constitutes an SRS. If it does, justify why it does. If it does not, explain why not.

a) You decide to number each of the classes (freshmen, sophomore, junior, and senior) separately and then, using a random digit table, select 20 students from each class.

b) You number all the students in the entire school and then, using a random digit table, select 80 students.

Question

You want a sample that represents all the students at your high school. For each of the following, determine if the method used constitutes an SRS. If it does, justify why it does. If it does not, explain why not.

a) You decide to number each of the classes (freshmen, sophomore, junior, and senior) separately and then, using a random digit table, select 20 students from each class. 

b) You number all the students in the entire school and then, using a random digit table, select 80 students.

ybarrap · Answer

I think I answered both in PM. Does it make sense?