Scatterplots-Correlation & Best Fit Lines

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What is a scatterplot?

Back

A scatterplot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

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What does correlation mean in statistics?

Back

Correlation refers to a statistical measure that describes the extent to which two variables change together.

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What are the types of correlation?

Back

The types of correlation are positive correlation, negative correlation, and no correlation.

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What is a line of best fit?

Back

A line of best fit is a straight line that best represents the data on a scatterplot, showing the trend of the data.

Front

How do you determine the line of best fit?

Back

The line of best fit can be determined using methods such as least squares regression, which minimizes the distance between the data points and the line.

Front

What does a positive correlation look like on a scatterplot?

Back

A positive correlation on a scatterplot appears as a pattern where, as one variable increases, the other variable also increases.

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What does a negative correlation look like on a scatterplot?

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A negative correlation on a scatterplot appears as a pattern where, as one variable increases, the other variable decreases.

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What does no correlation mean?

Back

No correlation means there is no discernible relationship between the two variables; the data points do not show any pattern.

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How can you describe the correlation in a scatterplot?

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You can describe the correlation in a scatterplot by observing the direction (positive or negative), strength (strong, moderate, weak), and form (linear or nonlinear) of the relationship.

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What is the purpose of using a line of best fit?

Back

The purpose of using a line of best fit is to make predictions about one variable based on the value of another variable.