1.3 Statistical design and experiments

12345678910111213141516
Across
  1. 6. The use of a mathematical or physical model to reproduce the conditions of a situation or process.
  2. 8. Dividing subjects with similar characteristics into blocks, and then, within each block, randomly assigning subjects to treatment groups.
  3. 9. A researcher observes and measures characteristics of interest of part of a population but does not change existing conditions.
  4. 15. A sample in which every possible sample of the same size has the same chance of being selected.
  5. 16. When a subject reacts favorably to a placebo when in fact the subject has been given no medicated treatment at all.
Down
  1. 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. 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. 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. 4. A technique where the subjects do not know whether they are receiving a treatment or a placebo.
  5. 5. Neither the experimenter nor the subjects know if the subjects are receiving a treatment or a placebo.
  6. 7. An investigation of one or more characteristics of a population. Usually, by asking questions.
  7. 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.
  8. 11. often leads to biased studies. Consists of only available members of the population.
  9. 12. Divide the population into groups, called clusters, and select all the members in one or more of the clusters.
  10. 13. Occurs when an experimenter cannot tell the difference between the effects of different factors on a variable.
  11. 14. A process of randomly assigning subjects to different treatment groups.