Scatter Plot & Line of Best Fit Practice

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What is a scatter plot?

Back

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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What is the purpose of a line of best fit?

Back

The line of best fit is used to summarize the relationship between the variables in a scatter plot, helping to predict values and identify trends.

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

Back

The slope of a line of best fit is calculated by taking the change in the y-values divided by the change in the x-values between two points on the line.

Front

What does a positive association in a scatter plot indicate?

Back

A positive association indicates that as one variable increases, the other variable also tends to increase.

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What does a negative association in a scatter plot indicate?

Back

A negative association indicates that as one variable increases, the other variable tends to decrease.

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What does 'no association' mean in the context of a scatter plot?

Back

'No association' means that there is no discernible relationship between the two variables; changes in one do not affect the other.

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What is a trendline?

Back

A trendline is a line that is drawn on a scatter plot to represent the general direction of the data points.

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How can you use a trendline to make predictions?

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You can use a trendline to estimate the value of one variable based on the value of another by finding the corresponding point on the line.

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What does it mean if there are many data points above the line of best fit?

Back

If there are many data points above the line of best fit, it suggests that the actual values are higher than the predicted values, indicating a potential underestimation.

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What does it mean if there are many data points below the line of best fit?

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If there are many data points below the line of best fit, it suggests that the actual values are lower than the predicted values, indicating a potential overestimation.