Scatter Plots and Trend Lines

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What is a scatter plot?

Back

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

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CCSS.8.SP.A.1

Front

What does a positive correlation in a scatter plot indicate?

Back

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

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CCSS.HSS.ID.B.5

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What does a negative correlation in a scatter plot indicate?

Back

A negative correlation indicates that as one variable increases, the other variable decreases.

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CCSS.HSS.ID.B.5

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What does it mean if there is no correlation in a scatter plot?

Back

No correlation means that there is no apparent relationship between the two variables.

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CCSS.HSS.ID.B.5

Front

How do you interpret a trend line in a scatter plot?

Back

A trend line shows the general direction of the data points and can be used to make predictions about one variable based on the other.

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CCSS.8.SP.A.2

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What is the purpose of using a trend line?

Back

The purpose of a trend line is to summarize the relationship between variables and to help predict future values.

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CCSS.8.EE.B.5

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How can you use a trend line to make predictions?

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You can extend the trend line to estimate the value of one variable based on a known value of the other variable.

Tags

CCSS.8.EE.B.5

Front

What does it mean if a scatter plot has a steep trend line?

Back

A steep trend line indicates a strong relationship between the two variables, meaning small changes in one variable result in large changes in the other.

Tags

CCSS.8.EE.B.5

Front

What does it mean if a scatter plot has a flat trend line?

Back

A flat trend line indicates a weak relationship between the two variables, meaning changes in one variable have little effect on the other.

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CCSS.HSS.ID.B.5

Front

What is the significance of outliers in a scatter plot?

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Outliers are data points that differ significantly from other observations and can affect the overall trend and interpretation of the data.

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CCSS.8.SP.A.1