CONCEPTUAL EXERCISE 68 A researcher is interested in maximum-security inmates. What sampling procedure is she using in each of the following? 1. She obtains a list of all inmates in maximum-security prisons in the United States and selects every 50th name. 2. She groups inmates by type of crime, determines the percentage of the total in each crime category, and uses that to randomly select a representative proportion from each group. 3. She groups maximum-security prisons by state, randomly selects 10 states, and, from those 10, randomly selects three prisons. She includes all the inmates in those three prisons in her sample