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Ch. 3-5 Statistics (Research Study Process (Question about how a treatment…

- - - - Tells how the data is dispersed around the mean of the variable
    - - The difference between the largest and smallest values in variable in a dataset
    - - Tells how all the observations in the variable are distributed or clustered about the mean of the variable
  - - - Symmetrical
      - Skewed
    - - Mean
        
        Sum of all of the scores divided by the number of scores
        
        Weighted Mean
        
        average of two averages, handicapped by the number of scores they represent
      - Mode
        
        the score or category that has the greatest frequency
        
        Major mode- peak that is larger in a multi-peaked distribution
        
        Minor Mode- peak that is shorter in a multi-peaked distribution
        
        Bimodal- distribution with two modes
      - Median
        
        Midpoint of a distribution of scores listed in ascending order
- - - - Provide an objective method for determining how well a specific score represents its population
      - Help researchers use data from sample to draw inferences about populations
      - Individuals with Z-scores near 0 are typical or representative/close to the population mean
      - X values can be transformed into a z-score
      - Will have the same shape as the distribution of raw scores
      - Will always have a mean of 0 and a standard deviation of 1