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# Scatter Diagrams and Trendline A+++

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Statistics                                                                                                         Dr S. Therianos

Scatter diagrams:

Def: A Scatter Diagram is a plot of ordered pairs of sample data.

The purpose of a scatter diagram or just scatter-gram is to give a visual presentation of the relationship between two quantitative variables.

The Independent variable x is always on the Horizontal axis.

The Dependent variable y is always on the Vertical axis.

The points are plotted but they are not joined together.

As the x-values increase we look at the scatter-gram to see what happens to the y-values.

If they increase, then there is positive relationship.

If they decrease, then there is a negative relationship.

If there is no pattern, then there is no relationship at all.

The technical tern for the relationship is correlation.

Def: Correlation:  A statistically significant linear relationship between the values of the dependent and independent variables.

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## [Solved] Scatter Diagrams and Trendline A+++

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Statistics Dr S. Therianos Scatter diagrams: Def: A Scatter Diagram is a plot of ordered pairs of sample data. The purpose of a scatter diagram or just scatter-gram is to give a visual presentation of the relations...
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### Scatter Diagrams and Trendline A+++

Statistics Dr S. Therianos Scatter diagrams: Def: A Scatter Diagram is a plot of ordered pairs of sample data. The purpose of a scatter diagram or just scatter-gram is to give a visual presentation of the relations...
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