Scatter Plots and Trend Lines

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What is a scatter plot?

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

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CCSS.8.SP.A.1

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What does a trend line represent in a scatter plot?

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

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CCSS.8.EE.B.5

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What is correlation in statistics?

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Correlation measures the strength and direction of a linear relationship between two variables.

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CCSS.HSF-LE.A.1B

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What are the types of correlation?

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Positive correlation, negative correlation, and no correlation.

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CCSS.HSS.ID.C.9

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What is a positive correlation?

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A positive correlation occurs when an increase in one variable leads to an increase in another variable.

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CCSS.HSS.ID.B.5

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What is a negative correlation?

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A negative correlation occurs when an increase in one variable leads to a decrease in another variable.

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CCSS.HSS.ID.B.5

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What does 'no correlation' mean?

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

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CCSS.HSF-LE.A.1B

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What is an outlier in a data set?

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An outlier is a data point that differs significantly from other observations in the data set.

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How do you identify an outlier?

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An outlier can be identified by looking for points that fall far away from the trend line or the general cluster of data points.

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What is the purpose of fitting a trend line to data?

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Fitting a trend line helps to summarize the data, making it easier to understand the overall trend and make predictions.

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CCSS.8.SP.A.2