1. A social worker wished to evaluate the benefits of letting nursing home residents care for a plant. On one floor, the residents were given a plant to care for in their room. On another floor, residents were not given a plant. The social worker measured their activity levels before and after. This is an example of a(n) __________.
2. A school psychologist compared the achievement scores of children who either had or had not been socially promoted. This study is using __________ data.
3. In _____________, a sample is selected from the list of population members by randomly selecting the first subject and then selecting the other members of the sample according to a prearranged scheme—by taking, say, every 5th, 1Oth, or 20th person on the list, until the sample is complete.
4. A strategy for establishing is to have an observer rate the same behavior sequence at different times throughout the study.
5. The problem with face-to-face interviewing is __________.
6. Withholding potentially biasing information from an observer is called _________the observer.
7. In the interrupted time-series design __________.
8. A researcher is interested in studying drug use in adolescence. He gathers a list of all high schools in the nation. He randomly selects 500 schools. From these schools, he randomly selects 3000 homerooms. From each homeroom, he selects 20 students using simple random sampling. His sampling process is an example of __________.
9. Mail surveys are associated with __________ while face-to-face surveys are associated with __________.
10. In __________ sampling, the population is classified into subgroups and simple random samples are taken from each subgroup.
11. People who commit suicide sometimes leave notes. A researcher analyzed the contents of suicide notes in order to explain why people commit suicide. This study has the flaw of __________.
12. The comparison group in a nonequivalent control group design is called nonequivalent because __________.
