Chapter 9 Review

Front

What does a positive correlation indicate in a scatter plot?

Back

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

Front

What does a negative correlation indicate in a scatter plot?

Back

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

Front

What is the correlation coefficient (r)?

Back

The correlation coefficient (r) is a statistical measure that describes the strength and direction of a relationship between two variables.

Front

What does an r value of 0 indicate?

Back

An r value of 0 indicates no correlation between the two variables.

Front

What does an r value close to 1 indicate?

Back

An r value close to 1 indicates a strong positive correlation.

Front

What does an r value close to -1 indicate?

Back

An r value close to -1 indicates a strong negative correlation.

Front

What is a line of best fit?

Back

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

Front

How can you determine if a correlation is strong, moderate, or weak?

Back

A correlation is considered strong if |r| is close to 1, moderate if |r| is around 0.5, and weak if |r| is close to 0.

Front

What does it mean if two variables are related?

Back

If two variables are related, it means there is a statistical association between them, but it does not imply causation.

Front

What is the purpose of a scatter plot?

Back

A scatter plot is used to visually display the relationship between two quantitative variables.