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  • I don't know how to describe a scatterplot using FODS. Do you?
  • Yes, I do. I'll show you!
  • FODS stands for form, outliers, direction and strength
  • Thank you! But now I need to know how to find and interpret the correlation between 2 variables. Do you know how?
  • To interpret the value see what variable is r closest to.
  • Yes, I do. r is what is used as the correlation coefficient and the value of r is always going to be between +1 and -1. 
  • Thanks! Now what about what are the properties of correlation?
  • You might also want to know how to use the linear model to make a prediction. You do this by using the equation Y=a + bX + e
  • They are between -1 and +1, independent of change of origin and possess the property of symmetry.
  • Thanks! I just have one more question. What is a residual plot and how does it help determine if a linear model is appropriate?
  • This determines if a linear model is appropriate because if the points on the graph are randomly around the horizontal axis then it is linear.
  • A residual plot is a graph that shows the relationship between an independent variable and the response variable.
  • Thank you!
  • You're welcome!
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