Scatter Plot Terms and Correlation

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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 grid.

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CCSS.8.SP.A.1

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What does a positive correlation indicate in a scatter plot?

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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 indicate in a scatter plot?

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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 is the correlation coefficient?

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The correlation coefficient is a numerical measure that describes the strength and direction of a relationship between two variables, ranging from -1 to 1.

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CCSS.HSS.ID.C.8

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What does it mean if a scatter plot has no association?

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It means there is no discernible relationship between the two variables; changes in one variable do not predict changes in the other.

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CCSS.HSS.ID.B.5

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What is a trend line in a scatter plot?

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A trend line is a straight line that best represents the data points in a scatter plot, showing the general direction of the relationship.

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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 the value of the other variable.

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CCSS.8.F.A.2

CCSS.HSF.IF.C.9

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What is an example of a negative linear association?

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An example is the relationship between the age of a car and its value; as the car gets older, its value typically decreases.

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CCSS.HSF-LE.A.1B

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What is an example of a positive linear association?

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An example is the relationship between the number of hours studied and test scores; as study hours increase, test scores tend to increase.

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CCSS.HSF-LE.A.1B

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What does it mean if a scatter plot shows a nonlinear association?

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It means the relationship between the two variables does not follow a straight line; it may curve or change direction.

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CCSS.8.F.A.3