Scatterplots & Trendlines

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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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CCSS.8.SP.A.1

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What does a positive association in a scatterplot indicate?

Back

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

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CCSS.HSS.ID.B.5

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What does a negative association in a scatterplot indicate?

Back

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

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CCSS.HSS.ID.B.5

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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 general direction of the data points.

Tags

CCSS.8.EE.B.5

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What does it mean if a scatterplot is nonlinear?

Back

A nonlinear scatterplot indicates that the relationship between the variables cannot be accurately represented by a straight line.

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CCSS.8.F.A.3

Front

How can you determine the length of time it would take for Pam to run 6 miles using a scatterplot?

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You can estimate the time by finding the point on the scatterplot that corresponds to 6 miles and reading the associated time value.

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What is the purpose of a trendline in a scatterplot?

Back

A trendline helps to visualize the general direction of the data points and can be used to make predictions.

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CCSS.8.SP.A.2

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What does it mean if there is no association in a scatterplot?

Back

No association means that there is no discernible pattern or relationship between the two variables.

Tags

CCSS.HSS.ID.B.5

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What is the formula for a linear equation?

Back

The formula for a linear equation is typically written as y = mx + b, where m is the slope and b is the y-intercept.

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CCSS.8.EE.B.6

CCSS.8.F.A.3

Front

How do you identify a line of best fit from multiple options?

Back

You identify a line of best fit by selecting the line that minimizes the distance from all data points to the line itself.

Tags

CCSS.8.EE.B.5