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Correlation & Regression, Degree to which x and y vary separately,…

- - - - Perfect correlation: always identified by a correlation of 1.0 and indicates a perfectly consistent relationship.
      - Line around data points: envelope
  - - - True experiement is necessary to establish cause and effect
  - - - Proportion of variability in one variable that can be determined fromt her relationship with the other variable. What percent of the variability in the other Y scores can be predicted from the relationship with X
  - - - Spearman measures when there is a consistently monotonic relationship.
- - - - r =
        
        SP
        
        √SSxSSʏ
  - - - Computational formula
        
        SP = 𝜮XY -
      - Mx is mean for X scores, Mʏ is mean for Y scores