Chapter 9 Review

Front

What is the correlation coefficient?

Back

A statistical measure that describes the strength and direction of a relationship between two variables, ranging from -1 to 1.

Front

What does a correlation coefficient of r = 0.89 indicate?

Back

A strong positive correlation between the two variables.

Front

What does a strong negative correlation mean?

Back

As one variable increases, the other variable tends to decrease.

Front

What is the range of possible values for a correlation coefficient?

Back

The range is from -1 to 1.

Front

What does a correlation coefficient of r = -0.87 signify?

Back

It indicates a strong negative correlation.

Front

What is a weak positive correlation?

Back

A relationship where one variable slightly increases as the other variable increases, but the relationship is not strong.

Front

What does it mean if there is no correlation?

Back

There is no predictable relationship between the two variables.

Front

How can you visually assess correlation?

Back

By examining a scatterplot, where the pattern of points indicates the type of correlation.

Front

What is the difference between positive and negative correlation?

Back

Positive correlation means both variables move in the same direction, while negative correlation means they move in opposite directions.

Front

What does a correlation coefficient of r = 0 indicate?

Back

It indicates no correlation between the two variables.