Making Predictions and Reading Scatterplots

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What is a scatterplot?

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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

Front

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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CCSS.HSS.ID.B.5

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What does a negative correlation indicate in a scatterplot?

Back

A negative correlation 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, used to make predictions.

Tags

CCSS.8.EE.B.5

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How can you determine if a line of best fit is accurate?

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You can determine if a line of best fit is accurate by checking how closely the data points cluster around the line.

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What is the purpose of making predictions using a scatterplot?

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The purpose is to estimate the value of one variable based on the value of another variable.

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If a scatterplot shows no correlation, what does that mean?

Back

It means there is no apparent relationship between the two variables being analyzed.

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CCSS.HSS.ID.B.5

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What is the significance of the slope of the line of best fit?

Back

The slope indicates the rate of change between the two variables; a steeper slope means a stronger relationship.

Tags

CCSS.8.EE.B.5

Front

How do you interpret the y-intercept of a line of best fit?

Back

The y-intercept is the value of the dependent variable when the independent variable is zero.

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CCSS.HSF.LE.B.5

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

Back

A cluster of points indicates that there is a concentration of data points in that area, suggesting a possible relationship.

Tags

CCSS.8.SP.A.1