### What is a Scatter Plot

A scatter plot is a diagram to present the relationship between two variables of a data set. It consists of a set of data points set on two axis. On the scatter plot, a single observation is presented by a data point with its horizontal position equal to the value of one variable and its vertical position equal to the value of the other variable. A scatter plot helps us to understand:

- Whether the two variables are related to each other or not
- What is the strength of their relationship
- The shape of their relationship
- The direction of their relationship
- Whether outliers are present

### How to Use SigmaXL to Generate a Scatter Plot

Data File: “Scatter Plot” tab in “Sample Data.xlsx”

Steps to render a Scatterplot in SigmaXL:

- Select the entire range of data (both “MPG” and “weight”)
- Click SigmaXL -> Graphical Tools -> Scatter Plots
- A new window named “Scatter Plots” pops up with the selected range of data appearing in the box under “Please select your data”

- Click “Next>>”
- A new window also named “Scatter Plots” appears
- Select “MPG” as the “Numeric Response (Y)”
- Select “weight” as the “Numeric Predictor (X1)”

- Click “OK>>”
- The scatterplot appears in the new tab “Scatterplot (1)”

Model summary: The figure above is SigmaXL’s output of the scatterplot data. You can immediately see the value of graphical displays of data. This information obtainable by viewing this output shows a relationship between weight and MPG. This scatterplot shows that the heavier the weight the lower the MPG value and vice versa.

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