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Sources of Knowledge (Tenacity (Hearing something enogh that you beleive…

- - - - Unequal distance between ranks
      - Mathematical operations (= or not equal to/ > or <)
      - Rank order
    - - No absolute 'zero'
      - Mathematical operations(= or not equal/> or </add/subtract)
      - Intervals between numbers on scale are numerically equal
    - - No numerical value
      - Label for variable
      - Categorical variable
      - Mathematical operations (= or not equal to)
    - - Score of '0" = absence of variable
      - All mathematical operations
- - - - Aptitude
      - Achievement
- - - - 0.00 = no reliability
      - -1.00 = perfect reliability
      - 1.00 = perfect reliability
  - - - Stability of test instrument over time
      - Threats
        
        Too close together they can remember how the test is done
        
        Two different people administering test might be two different ways test was administered
        
        Uncontrollable factors
    - - Control for test/retest problems
      - Threats
        
        How do you know if they are equivalent
        
        Practice effect-fixed by having two versions of the same test
    - - Measure equivalency of content but not stability
      - Threats: dont know if two halvs are going to be equal
      - Written test
    - - Having multiple people testing the same information and see if they are getting the same result/reporting the same outcome
- - - - Concurrent: Measure current performance
      - Predictive: Measuring future performance
- - - - Gather a lot of informaiton in a short period of time
      - Animosity
      - Wide range/sample of people
    - - Wording may not be clear of have bias
      - Sampling(Random)/population
  - - - Bringing kids into a lab to see how they interact withthings in that setting
    - - Going to a playground after school and looking how they interact with things in that setting