Scatter plots are used to show possible relationships between two variables which share a relationship to the same thing.
The scatter plot above shows the relationship between the percentage of an area and the probability of detecting a non-event (PODn) for a forecast model used to project the most probable ceiling (altitude) and visibility for air traffic.
A scatter plot could also be used to show a probability of students being late for class after having a long weekend by figuring what percentage of students were tardy for a period of time and marking the days which followed a long weekend. If the dots remained equally distributed, it could be figured that being late for class and students being away for long weekends have no effect upon each other. If the dots became clustered on Monday mornings following a long weekend it could be figured that long weekends and student punctuality were directly related to each other.
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