Scatterplots & Trend Lines

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What is a scatterplot?

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A scatterplot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

Tags

CCSS.8.SP.A.1

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What does a trend line represent in a scatterplot?

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A trend line is a straight line that best represents the data points in a scatterplot, indicating the general direction of the data.

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CCSS.8.EE.B.5

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What does a positive correlation in a scatterplot indicate?

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

Tags

CCSS.HSS.ID.B.5

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What does a negative correlation in a scatterplot indicate?

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

Tags

CCSS.HSS.ID.B.5

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What is a linear relationship in a scatterplot?

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A linear relationship is when the data points in a scatterplot can be approximated by a straight line.

Tags

CCSS.8.F.A.3

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What is a nonlinear relationship in a scatterplot?

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A nonlinear relationship is when the data points in a scatterplot do not follow a straight line and may curve or cluster.

Tags

CCSS.8.F.A.3

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How do you interpret the coordinates of a point on a scatterplot?

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The x-coordinate represents the value of the independent variable, while the y-coordinate represents the value of the dependent variable.

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What is the purpose of using scatterplots in data analysis?

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Scatterplots are used to visually assess the relationship between two variables and to identify trends, patterns, or outliers.

Tags

CCSS.8.SP.A.1

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

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

Tags

CCSS.8.SP.A.1

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How can you determine if a scatterplot has a strong correlation?

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A strong correlation is indicated by data points that are closely packed around the trend line, showing a clear relationship.