The population is summer school students at Diablo Valley College. The samples are taken from a complete Indexed list of students who were enrolled in a summer course at UCSB.

Simple Random Sample

a. All students who took Speech courses are chosen.

b. We randomly choose 80 students who took asynchronous courses and 120 students who took synchronous courses.

c. Using a random number generator, 200 student ID numbers are chosen by the index number on the left. d. Beginning at index number 22, every 47th student is chosen.

Stratified Sample

a. All students who took Speech courses are chosen.

b. We randomly choose 80 students who took asynchronous courses and 120 students who took synchronous courses.

c. Using a random number generator, 200 student ID numbers are chosen by the index number on the left. d. Beginning at index number 22, every 47th student is chosen.

Systematic Sample

a. All students who took Speech courses are chosen.

b. We randomly choose 80 students who took asynchronous courses and 120 students who took synchronous courses.

c. Using a random number generator, 200 student ID numbers are chosen by the index number on the left. d. Beginning at index number 22, every 47th student is chosen.

Cluster Sample

a. All students who took Speech courses are chosen.

b. We randomly choose 80 students who took asynchronous courses and 120 students who took synchronous courses.

c. Using a random number generator, 200 student ID numbers are chosen by the index number on the left. d. Beginning at index number 22, every 47th student is chosen.