Identify the sampling scheme used in each of the following examples. A chef asks the current customers in a restaurant if they would be interested in a ponential new item on the menu Voluntary Response Fliers posted on a college campus encourage readers to scan a QR code to take an online survey Voluntary Response An email is sent to all union members inviting those interested to vote for a number of proposed contracts Voluntary Response Researchers randomly select hospitals and survey all patients treated at those hospitals Simple Random Sample A journalist asks random passers-by on the street for their opinion on a new construction project in the neighborhood Voluntary Response Researchers randomly select hospitals and survey all nurses working in those hospitals Simple Random Sample A university randomly selects students from their full student roster for a survey Cluster Sample A survey of international students at a university is conducted by surveying a random selection of students from each foreign country represented at the school Cluster Sample A hospital randomly assigns a percentage of all patients to receive a customer feedback survey Convenience Sample A sample of doctors at a hospital is taken by randomly selecting a number