Scatter Plots and Lines of Best Fit

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What is a scatter plot?

Back

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 the line of best fit represent in a scatter plot?

Back

The line of best fit is a straight line that best represents the data points in a scatter plot, indicating the overall trend of the data.

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CCSS.8.SP.A.2

Front

What is correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together.

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CCSS.HSS.ID.C.9

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What are the types of correlation?

Back

There are three types of correlation: positive correlation, negative correlation, and no correlation.

Tags

CCSS.HSS.ID.C.9

Front

What does positive correlation mean?

Back

Positive correlation means 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 negative correlation mean?

Back

Negative correlation means that as one variable increases, the other variable tends to decrease.

Tags

CCSS.HSS.ID.B.5

Front

What does no correlation mean?

Back

No correlation means that there is no predictable relationship between the two variables.

Tags

CCSS.HSS.ID.B.5

Front

How can you predict values using a scatter plot?

Back

You can predict values by drawing a trend line (line of best fit) and using it to estimate the value of one variable based on the value of another.

Front

What is the purpose of a trend line in a scatter plot?

Back

The purpose of a trend line is to summarize the relationship between the variables and to make predictions.

Front

How do you determine the slope of a line of best fit?

Back

The slope of a line of best fit is determined by the change in the y-values divided by the change in the x-values between two points on the line.

Tags

CCSS.8.EE.B.5