14._Chapter_14_Slides--Scatterplots

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10 Terms

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What is a scatterplot used for?
A scatterplot is used to show the relationship between quantitative variables measured on the same individuals.
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How do you create a scatterplot?
To make a scatterplot, take measurements of two variables, X and Y, for each individual and plot the points (x, y) on a graph.
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What indicates a positive direction in a scatterplot?
If as x increases, y also tends to increase, resulting in a slope that goes up.
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What indicates a negative direction in a scatterplot?
If as x increases, y tends to decrease, resulting in a slope that goes down.
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What is the correlation coefficient symbol?
The correlation coefficient is represented by the symbol r.
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What range does the correlation coefficient (r) fall within?
The correlation coefficient (r) values range from -1 to 1.
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What does it mean if r is close to 1?
If r is close to 1, it signifies a strong positive relationship between the variables.
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What is a misleading strength in a scatterplot?
A misleading strength occurs when the relationship appears stronger than it actually is, often due to extending the axes.
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Define linear relationship in the context of scatterplots.
A linear relationship is when the points plotted can be closely approximated by a straight line.
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Why does correlation not imply causation?
Causation implies some correlation, but correlation alone does not prove that one variable causes the other.