Scatterplots Correlation

Front

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 a positive correlation indicate in a scatterplot?

Back

A positive correlation indicates that as one variable increases, the other variable also tends to increase.

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What does a negative correlation indicate in a scatterplot?

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A negative correlation indicates that as one variable increases, the other variable tends to decrease.

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What does no correlation mean in a scatterplot?

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No correlation means that there is no apparent relationship between the two variables; changes in one variable do not predict changes in the other.

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How can you identify a positive correlation in a scatterplot?

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A positive correlation can be identified when the points on the scatterplot slope upwards from left to right.

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How can you identify a negative correlation in a scatterplot?

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A negative correlation can be identified when the points on the scatterplot slope downwards from left to right.

Front

What is the purpose of using scatterplots?

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Scatterplots are used to visually represent the relationship between two quantitative variables and to identify patterns or trends.

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What is an example of a positive correlation in real life?

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An example of a positive correlation is the relationship between study time and test scores; generally, more study time leads to higher test scores.

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What is an example of a negative correlation in real life?

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An example of a negative correlation is the relationship between the amount of gas in a tank and the number of miles driven; as miles driven increases, gas remaining decreases.

Front

What does it mean if a scatterplot shows a cluster of points?

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A cluster of points in a scatterplot indicates that there is a strong relationship between the two variables in that area.