a. A computer randomly chooses a customer's phone number, and a customer service rep calls to survey the customer b. Customers are grouped by their zip code. A few people for each zip code are surveyed. QUESTION 18 Mike's pizza company is searching for a new specialty pizza to add to their menu. Five specialty pizzas are on the ballot, and the cashier polls every 20th customer that orders a pizza. What type of sampling meth Cluster Sampling Convenience Sampling Stratified Random Sampling Systematic Sampling QUESTION 19 A farmer is researching the effectiveness of a pest control spray. He divides his orchard into 5 sections. He then inspects all the trees within 2 of those sections. What type of sampling method is he using?