Making Predictions and Reading Scatterplots

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What is a scatterplot?

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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.

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CCSS.8.SP.A.1

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

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The line of best fit represents the trend in the data, showing the general direction that the data points follow.

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CCSS.8.SP.A.2

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How can you determine the line of best fit?

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The line of best fit can be determined by visually inspecting the scatterplot and drawing a line that best represents the data points, or by using statistical methods like linear regression.

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What is correlation in the context of scatterplots?

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Correlation refers to the relationship between two variables, indicating how one variable may change in relation to another.

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CCSS.HSS.ID.B.5

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What are the types of correlation?

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The types of correlation are positive correlation (both variables increase together), negative correlation (one variable increases while the other decreases), and no correlation (no apparent relationship).

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CCSS.HSS.ID.C.9

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What does a positive correlation look like on a scatterplot?

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A positive correlation appears as an upward slope from left to right, indicating that as one variable increases, the other variable also increases.

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CCSS.HSS.ID.B.5

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What does a negative correlation look like on a scatterplot?

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A negative correlation appears as a downward slope from left to right, indicating that as one variable increases, the other variable decreases.

Tags

CCSS.HSS.ID.B.5

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What is the purpose of making predictions using a line of best fit?

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The purpose is to estimate the value of one variable based on the value of another variable, using the trend shown in the scatterplot.

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How do you interpret a scatterplot with no correlation?

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A scatterplot with no correlation shows a random distribution of points, indicating that there is no predictable relationship between the two variables.

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CCSS.HSS.ID.B.5

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What is the significance of outliers in a scatterplot?

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Outliers are data points that differ significantly from other observations. They can affect the line of best fit and may indicate variability in the data.

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CCSS.8.SP.A.1