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

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What does a positive correlation indicate in a scatterplot?

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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?

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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 no correlation in a scatterplot?

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

Tags

CCSS.HSS.ID.B.5

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What is a line of best fit?

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A line of best fit is a straight line that best represents the data on a scatterplot, showing the trend of the data.

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CCSS.8.EE.B.5

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How do you determine the line of best fit?

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The line of best fit is determined by minimizing the distance between the line and all the data points, often using a method called least squares.

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What is a positive linear association?

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A positive linear association means that the data points tend to rise together, forming a straight line with a positive slope.

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CCSS.HSF-LE.A.1B

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What is a negative linear association?

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A negative linear association means that as one variable increases, the other variable decreases, forming a straight line with a negative slope.

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What is a nonlinear association?

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A nonlinear association occurs when the relationship between the variables cannot be accurately represented by a straight line.

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CCSS.HSS.ID.B.5

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How can you predict values using a scatterplot?

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You can predict values by finding the corresponding point on the line of best fit for a given value of one variable.