Question

Check my answers.

Answer 1

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.

c) You first number the classes (freshmen, sophomore, junior, and senior) and then, using a random digit table, select one class. Then, you number all the students in that class and, using a random digit table, select 80 students from that class.

Answer 2

My answers :
A)
No, this one uses stratified random sampling.

B)
Yes because each student could be equally selected

C)
No, this one uses cluster sampling.