Scatterplots and Lines of Best Fit

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What is a scatterplot?

Back

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

Tags

CCSS.8.SP.A.1

Front

What does a line of best fit represent in a scatterplot?

Back

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

Tags

CCSS.8.EE.B.5

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How do you identify a positive association in a scatterplot?

Back

A positive association is identified when, as one variable increases, the other variable also tends to increase, resulting in an upward trend.

Tags

CCSS.HSS.ID.B.5

Front

What is an outlier in a scatterplot?

Back

An outlier is a data point that significantly differs from the other points in the dataset, often appearing far away from the trend.

Tags

CCSS.8.SP.A.1

Front

How can you predict values using a scatterplot?

Back

You can predict values by using the line of best fit to estimate the value of one variable based on the value of another.

Front

What does a negative association look like in a scatterplot?

Back

A negative association is observed when, as one variable increases, the other variable tends to decrease, resulting in a downward trend.

Tags

CCSS.HSF-LE.A.1B

Front

What is the purpose of a trend line in a scatterplot?

Back

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

Front

How do you determine if there is a line of best fit for a scatterplot?

Back

You determine if there is a line of best fit by assessing whether the data points show a clear trend that can be approximated by a straight line.

Front

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

What does it mean if a scatterplot has no association?

Back

If a scatterplot has no association, the data points are scattered randomly, showing no discernible pattern or trend.

Tags

CCSS.HSS.ID.B.5