Across
- 6. The use of a mathematical or physical model to reproduce the conditions of a situation or process.
- 8. Dividing subjects with similar characteristics into blocks, and then, within each block, randomly assigning subjects to treatment groups.
- 9. A researcher observes and measures characteristics of interest of part of a population but does not change existing conditions.
- 15. A sample in which every possible sample of the same size has the same chance of being selected.
- 16. When a subject reacts favorably to a placebo when in fact the subject has been given no medicated treatment at all.
Down
- 1. Subjects are paired up according to a similarity. One subject in the pair is randomly selected to receive one treatment while the other subject receives a different treatment.
- 2. Depending on the focus of the study, members of the population are divided into two or more subsets, called strata, that share similar characteristics. A sample is then randomly selected from each of the strata.
- 3. A sample in which each member of the population is assigned a number. The members are ordered in some way, a starting number is randomly selected, and then sample members are selected at regular intervals from the starting number.
- 4. A technique where the subjects do not know whether they are receiving a treatment or a placebo.
- 5. Neither the experimenter nor the subjects know if the subjects are receiving a treatment or a placebo.
- 7. An investigation of one or more characteristics of a population. Usually, by asking questions.
- 10. A treatment is applied to part of a population and responses are observed. Another part of the population may be used as the control group, in which no treatment is applied.
- 11. often leads to biased studies. Consists of only available members of the population.
- 12. Divide the population into groups, called clusters, and select all the members in one or more of the clusters.
- 13. Occurs when an experimenter cannot tell the difference between the effects of different factors on a variable.
- 14. A process of randomly assigning subjects to different treatment groups.