Stats 355

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Stats 355
2012-02-27 15:09:30
stats 355 section

stats section 3 describtions
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  1. Using graphs and numbers to describe data
    Exploratory data analysis
  2. based on haphazardly selectred individual cases
    anecdotal evidence
  3. data thats collected for a particular purpose but can also serve as the basis for drawing sound conclusions about other research questions
    Available data
  4. Observeations of individuals and measure variables of interest but do not attempt to influence the responses
    Observation study
  5. Deliberately impose some treatment on individuals and observe their responses
  6. Individuals on which the experiment is done are the:
    Experimental units
  7. When the experimental units are human beings they are called:
  8. When a specific experimental condition is applied to the units its called:
  9. The explanatory variables in an experiment are often called:
  10. The group of patients who receive a sham treatment is called:
    a control group
  11. if the design of a study systematically favors certain outcomes
  12. The design of an experiment:
    • response variable or variables
    • the factors (explanatory variables
    • the layout of the treatments
  13. An observed effect so large that it would rarely occur by chance is called:
    statistically significant
  14. neither subjects themselves nor the medical personnel who worked with them knew which treament any subject had recieved
  15. compares just two treatments by matching subjects in pairs
    matched pairs design
  16. a group of experimental units or subjects that are known before the experiment to be similar in some way that is expected to affect the response to the treatment
    A block
  17. The random assignment of units to treatments is carried out separately within each block
    block design
  18. The basic principles of statistical design:
    • control
    • randomization
    • repetition
  19. whats a tool for randomization?
    table of random digits
  20. What reduces the role of chance variation and makes the experiment more sensitive to differences among the treatments
    Repetition of the treaments on many units
  21. The entire group of individuals that we want information about is called:
  22. part of the population that we actually examine inorder to gather information
    a sample
  23. consists of people who choose themselves by responding to a general appeal
    voluntary response sample
  24. size n consits of n individuals from the population chosen in such a way that every set of