Scatterplots and Trendlines

Front

What is a scatterplot?

Back

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.

Front

What does a line of best fit represent in a scatterplot?

Back

A line of best fit is a straight line that best represents the data on a scatterplot, showing the general direction of the relationship between the variables.

Front

How can you determine the expected value from a scatterplot?

Back

You can determine the expected value by locating the corresponding x-value on the scatterplot and finding the y-value on the line of best fit.

Front

What does a positive association in a scatterplot indicate?

Back

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

Front

What does a negative association in a scatterplot indicate?

Back

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

Front

What is a trendline?

Back

A trendline is a line that is drawn on a scatterplot to indicate the general direction of the data points.

Front

What is the difference between a function and a non-function in relation to scatterplots?

Back

A function is a relation where each input (x-value) has exactly one output (y-value). A non-function may have an input with multiple outputs.

Front

How do you identify a function from a scatterplot?

Back

You can identify a function by checking if any vertical line drawn through the graph intersects it at more than one point.

Front

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

Back

No correlation means there is no apparent relationship between the two variables; the data points do not show any trend.

Front

How can you use a trendline to make predictions?

Back

You can use a trendline to make predictions by extending the line and finding the corresponding y-value for a given x-value.