Scatterplots and Lines of Best Fit

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What is a scatterplot?

Back

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.

Tags

CCSS.8.SP.A.1

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What does a positive correlation indicate in a scatterplot?

Back

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 indicate in a scatterplot?

Back

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 line of best fit?

Back

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

Tags

CCSS.8.EE.B.5

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

Back

The slope of a line of best fit can be determined by calculating 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

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What does the slope of a line represent in a scatterplot?

Back

The slope of a line represents the rate of change between the two variables.

Tags

CCSS.8.EE.B.5

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What is the y-intercept in a line of best fit?

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The y-intercept is the point where the line crosses the y-axis, representing the value of y when x is zero.

Tags

CCSS.HSF.LE.B.5

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How can you use a scatterplot to make predictions?

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You can use a scatterplot to make predictions by extending the line of best fit to estimate the value of one variable based on the value of the other.

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

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

Tags

CCSS.8.EE.B.5

Front

What type of correlation would you expect between temperature and ice cream sales?

Back

Positive correlation.

Tags

CCSS.HSF-LE.A.1B