Problem 6: Identify the sampling technique used and explain your reasoning

a. At a local community college, four statistics classes are randomly selected out of 20 and all of the students from each class are interviewed

b. Every 5th member of the company received a bonus check of 100 dollars

c. A student asked his classmates to participate in his sociology project

d. At a local community college, six students from each classe are randomly selected for the interview

e. Every person, who got a red marble from the fair box, will be assigned to help at the event