Scatterplots & Trend Lines

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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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What does a trend line represent in a scatterplot?

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A trend line is a straight line that best represents the data on a scatterplot. It shows the general direction (trend) of the data points.

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What is the equation of a trend line in slope-intercept form?

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How do you determine the slope of a trend line?

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The slope of a trend line is determined by the change in the y-values divided by the change in the x-values (rise over run).

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What does a positive slope indicate in a trend line?

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A positive slope indicates that as the x-values increase, the y-values also increase, showing a positive correlation between the two variables.

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What does a negative slope indicate in a trend line?

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A negative slope indicates that as the x-values increase, the y-values decrease, showing a negative correlation between the two variables.

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What does it mean if there is no trend line in a scatterplot?

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If there is no trend line, it means there is no clear relationship or association between the variables being plotted.

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What is a positive correlation?

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A positive correlation means that as one variable increases, the other variable also tends to increase.

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What is a negative correlation?

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

Front

What is the y-intercept in the equation of a trend line?

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