- 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!