# survey #3

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1. when sampling the goal is...
to obtain a representative data set to generalize to the population
2. two types of general types of sampling
-probability sampling

- nonprobability sampling
3. (types of general types of sampling) Probability sampling
• -relies on chance to determine inclusion in sample
• *anyone can become a participant

**this type of sample is preferred
4. (types of general types of sampling) Nonprobability sampling
-sample selected in other ways

*ask people you know or random people at the mall
5. definitiion Reliability
the stability or consistency of our measurements
6. (reliability) random error (1-3)
• nonsystematic mistakes in measurement
• *ex: misreading a questionnaire item
• *observer looks away when coding behavior
• *nonsystematic misintrepretations of a behavior
7. Reliability
-consistency of measurement

• -consistency can be conceptualized in different ways
• *therefore there are different types of reliability

• -usually measured in correlation
• *should be a positive correlation
8. (types of reliability) Interrater reliability
degree of agreement between two independent raters
9. (types of reliability) Test-retest reliability
degree of consistency over time
10. (types of reliability) Internal consistency reliability
degreee to which the items of a measure all measure the same thing
11. (types of reliability) Perfect relaibility
• -reliability is a measure of consistency
• ***perfect reliability means that the scores are perfectly consistent
12. (types of reliability) Good reliability
-reliability deteriorates when the consistency is lost

-the rank of orderings are still reasonably consistent

13. (types of reliability) Fair reliability
- as reliability deteriorates further, the rank orderings from the two testings are less similar

14. (types of reliability) Poor reliability
• -when you reach the point where the rank orderings have no relationship to one another, your reliabilty is poor
• *new test would administer a different pattern of results

 Author: efrain12 ID: 186154 Card Set: survey #3 Updated: 2012-11-30 00:24:00 Tags: research Folders: Description: survey 3 Show Answers: