Scatterplots and trend lines review

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 grid.

Front

What is a trend line?

Back

A trend line is a straight line that best represents the data on a scatterplot, indicating the general direction of the data points.

Front

How do you interpret a positive correlation in a scatterplot?

Back

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

Front

How do you interpret a negative correlation in a scatterplot?

Back

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

Front

What does no correlation mean in a scatterplot?

Back

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 line of best fit?

Back

The line of best fit is the trend line that minimizes the distance between itself and all the data points in a scatterplot.

Front

How can you use a trend line to make predictions?

Back

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

Front

What is the purpose of using scatterplots in data analysis?

Back

Scatterplots are used to visually assess the relationship between two variables, helping to identify trends, correlations, and outliers.

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What is an example of a positive correlation?

Back

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

Front

What is an example of a negative correlation?

Back

An example of a negative correlation is the relationship between outside temperature and the number of layers of clothing worn; as temperature increases, layers worn typically decrease.