ScatterPlots/Line of Best Fit

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What is a scatter plot?

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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 association in a scatter plot indicate?

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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 scatter plot indicate?

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

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CCSS.HSF-LE.A.1B

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What is the line of best fit?

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The line of best fit is a straight line that best represents the data on a scatter plot, showing the overall 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 the least squares method.

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

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No association means that there is no discernible relationship between the two variables; changes in one variable do not affect the other.

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CCSS.HSS.ID.B.5

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What is correlation?

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Correlation is a statistical measure that describes the strength and direction of a relationship between two variables.

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CCSS.HSS.ID.C.9

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What is a strong positive correlation?

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A strong positive correlation means that the data points are closely clustered around a line of best fit that slopes upwards.

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CCSS.HSS.ID.B.5

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What is a strong negative correlation?

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A strong negative correlation means that the data points are closely clustered around a line of best fit that slopes downwards.

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CCSS.HSS.ID.B.5

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What is the purpose of the line of best fit in data analysis?

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The line of best fit helps to predict values and understand the relationship between variables in data analysis.

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CCSS.8.SP.A.2