Trend Lines and Scatter Plots

Front

What is a trend line?

Back

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

Front

What does a positive correlation indicate?

Back

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

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable decreases.

Front

What does no correlation mean?

Back

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

Front

How do you identify a positive correlation on a scatter plot?

Back

A positive correlation is identified by data points that slope upwards from left to right.

Front

How do you identify a negative correlation on a scatter plot?

Back

A negative correlation is identified by data points that slope downwards from left to right.

Front

What is a scatter plot?

Back

A scatter plot is a graph that displays values for two variables for a set of data, using dots to represent the data points.

Front

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

Back

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

Front

What is the formula for calculating the slope of a trend line?

Back

The slope (m) is calculated as m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are two points on the line.

Front

What does it mean if a trend line is steep?

Back

A steep trend line indicates a strong relationship between the variables, meaning a small change in one variable results in a large change in the other.