4. In each of the following examples, identify the sampling method used. a. Instructors are interested in knowing what eating techniques their students are utilizing. Rather than assessing all students, the

researchers randomly select one specific class to comprise their sample. b. National Geographic collects data on its readers by asking them to fill out and send in a survey from the March issue. c. A psychologist is studying the sleep patterns of the 3960 students in her basement. She decides to start by asking a random sample of 30 students how many hours of sleep they get weekday nights. The psychologist assigns each student a number from 0001 to 3960 and uses a computer to randomly generate a list of 30 numbers to select the students for the sample.