Chapter 4 Test Correlation & Regression Lines

Front

What does a correlation coefficient of 0 indicate?

Back

No correlation between the variables.

Front

What does a strong positive correlation look like on a graph?

Back

As one variable increases, the other variable also increases, forming a steep upward slope.

Front

What does a strong negative correlation look like on a graph?

Back

As one variable increases, the other variable decreases, forming a steep downward slope.

Front

What is the range of the correlation coefficient (r)?

Back

The correlation coefficient (r) ranges from -1 to 1.

Front

What does a correlation coefficient close to 1 indicate?

Back

A strong positive correlation.

Front

What does a correlation coefficient close to -1 indicate?

Back

A strong negative correlation.

Front

What does a correlation coefficient close to 0 indicate?

Back

A weak or no correlation.

Front

How do you interpret a correlation coefficient of 0.8458?

Back

This indicates a strong positive correlation between the two variables.

Front

What is a linear regression model used for?

Back

To predict the value of a dependent variable based on the value of one or more independent variables.

Front

What is the purpose of a trend line in a scatter plot?

Back

To show the general direction of the data points and to help predict values.