1. True experiments differ from quasi-experiments in having:
2. Whenever a researcher schedules a treatment following high or low scores on the dependent measure or selects subjects based upon extreme scores he should be concerned with the threat to internal validity of __________.
3. In the interrupted time-series design __________.
4. Probability sampling and methods of survey administration contribute __________ error compared to question wording.
5. Rosemary Wood, the secretary for President Nixon, erased portions of the tapes where the President and his staff discussed the Watergate break-in. Later scholars have examined these tapes to assess the degree of integrity of the Nixon Presidency. This example represents the problem of __________ in archival data.
6. When well done, __________ is NOT a major source of error in surveys.
7. The Notel researchers evaluated the rival hypothesis that observed increases in children's aggression after the introduction of television were due to maturation by:
8. A coding scheme classifies an animal's behavior into categories such as grooming, looking for food, and sexual display. This scheme is using a(n) __________ description.
9. __________ data are data collected previously by people not directly associated with the current research.
10. In nonprobability sampling, the likelihood of selecting a particular subject is __________, while in probability sampling, the likelihood of selecting a particular subject is __________.
11. The pretreatment observations in the interrupted time-series design are like the in a single-case experiment.
12. The OXO design applied to group data is called the:
