Statistics Test 1

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Statistics Test 1
2012-10-04 11:07:14
Statistics Test

Statistics Test 1
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  1. Sampling Error
    Discrepany that exisits between a smaple statistic and the corresponding populatino paramenter
  2. Experiment
    manipulate a varaiable
  3. Correlational Study
    Measures two different variable to see if there is a relationship between them.
  4. Independent variable
    The varible that is manitpulated 
  5. Dependent Variable
    Is the varable observed to assess the effect of a treatment
  6. discrete variable
    Separate categories. Whole Numbers.
  7. continuous variable
    infinite number of possible values
  8. Nominal Scales
    Consists of a set of categories that have different names.
  9. Ordinal Scale
    Consists of a set of categories that are organized in an ordered sequence. 
  10. Interval Scale
    Consists of categories with exactly the same size intervals. Zero is abritary.
  11. Ratio Scale
    Same as interval but zero is the bottom.
  12. Positive Skew
    Where the majority of the Data is on the left
  13. Negative Skew
    where the majority of the Data is on the right
  14. Sample
    sert of individuals selected from a apopulation, ussally to represent the population.
  15. Cardinality
    # of objects in a set
  16. Formula for Z- Score and what the variable stand for.
    Z= [X - (MUE)]/(sigma)

    • X = value given or reequest to find
    • MUE = Average
    • Sigma = Standard diviation
  17. Statistic
    is a value that describes a sample
  18. parameter
     is a value that describes a population
  19. The central tendency of a set of measurements is a 
    —single score that represents the center of the distribution.
  20. What does variablity measure?
    How far values tend to be from the central tendency.