scatter plots and trend lines

Front

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.

Front

What is a trend line?

Back

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

Front

How do you determine the best fit trend line?

Back

The best fit trend line is determined by minimizing the distance between the line and all the data points, often using methods like least squares.

Front

What does a positive correlation mean in a scatter plot?

Back

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

Front

What does a negative correlation mean in a scatter plot?

Back

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

Front

What does no correlation mean?

Back

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

Front

What does the slope of a trend line represent?

Back

The slope of a trend line represents the rate of change between the two variables; it indicates how much one variable changes for a unit change in the other.

Front

How can you identify a positive association in a scatter plot?

Back

A positive association is identified when the data points tend to rise from left to right on the scatter plot.

Front

How can you identify a negative association in a scatter plot?

Back

A negative association is identified when the data points tend to fall from left to right on the scatter plot.

Front

What is the purpose of using a trend line in data analysis?

Back

The purpose of using a trend line is to summarize the relationship between variables and make predictions based on the data.