Scatterplots

Front

What is a scatterplot?

Back

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

Front

What does a trend line in a scatterplot represent?

Back

A trend line is a straight line that best represents the data points in a scatterplot, indicating the general direction of the relationship between the variables.

Front

How can you use a scatterplot to make predictions?

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You can use a scatterplot to make predictions by extending the trend line to estimate values for one variable based on known values of the other variable.

Front

What does a positive correlation in a scatterplot indicate?

Back

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

Front

What does a negative correlation in a scatterplot indicate?

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

Front

What does no correlation mean in a scatterplot?

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No correlation means there is no apparent relationship between the two variables; changes in one variable do not predict changes in the other.

Front

What is the purpose of identifying correlation in data?

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Identifying correlation helps to understand the relationship between variables, which can inform predictions and decision-making.

Front

How do you determine the type of correlation from a scatterplot?

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You determine the type of correlation by observing the direction of the trend line: upward for positive, downward for negative, and scattered for no correlation.

Front

What is an example of a positive correlation?

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An example of a positive correlation is the relationship between study time and test scores; more study time generally leads to higher scores.

Front

What is an example of a negative correlation?

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An example of a negative correlation is the relationship between the amount of exercise and body weight; more exercise typically leads to lower body weight.