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QM Review (Review #1 (What is validity? How does it differ from…

- - - - :bulb: Whether an instrument measures what it
        set out to measure
    - - :bulb: Consistency of the result
  - - - Researchers r interested in the :couple_with_heart: btwn systematic & unsystematic variation
- - - - Standard deviation >
        the square root of the variance
      - Sum of squares >
        the total variability
  - - - :bulb: collection of units to which we want to generalize
    - - :bulb: smaller subset drawn from the population
  - - - :bulb: Measure of central tendency in ND
    - - :bulb: Measure of distribution dispersion
        in ND