Scatterplots-Correlation & Best Fit Lines

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What is a scatterplot?

Back

A scatterplot is a graph that displays values for typically two variables for a set of data. Each point represents an observation in the dataset.

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What does correlation mean in a scatterplot?

Back

Correlation refers to the relationship between two variables in a scatterplot, indicating how one variable may change in relation to another.

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What are the types of correlation?

Back

There are three types of correlation: 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 points.

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How do you identify an outlier in a scatterplot?

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An outlier is a data point that is significantly different from other observations in the dataset, often appearing far away from the trend of the other points.

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What does a positive correlation look like on a scatterplot?

Back

A positive correlation on a scatterplot appears as a line that slopes upwards from left to right, indicating that as one variable increases, the other 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 line that slopes downwards from left to right, indicating that as one variable increases, the other decreases.

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What does no correlation look like on a scatterplot?

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No correlation appears as a scatter of points with no discernible pattern or trend, indicating that changes in one variable do not affect the other.

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How can you use a scatterplot to make predictions?

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You can use a scatterplot and the line of best fit to make predictions by extending the line to estimate values for one variable based on known values of the other.

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What is the purpose of a trend line in a scatterplot?

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A trend line helps to summarize the relationship between the variables and can be used to make predictions about future data points.