Residuals & Correlation

Front

What is a residual?

Back

A residual is the vertical distance between a data point and a line of fit.

Front

How do you calculate a residual?

Back

Residual = Observed - Predicted

Front

What should a residual plot look like?

Back

A residual plot should appear random, with no distinct pattern.

Front

How many zero residuals are there in a given residual plot?

Back

1

Front

What does a strong positive correlation indicate?

Back

As one variable increases, the other variable also increases.

Front

What does a strong negative correlation indicate?

Back

As one variable increases, the other variable decreases.

Front

What is the correlation coefficient?

Back

A numerical measure of the strength and direction of a linear relationship between two variables.

Front

What does a correlation coefficient of 0 indicate?

Back

No correlation between the two variables.

Front

What does a correlation coefficient of 1 indicate?

Back

Perfect positive correlation.

Front

What does a correlation coefficient of -1 indicate?

Back

Perfect negative correlation.