Chapter 7 Review

Front

What is correlation?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or zero.

Front

What does a correlation coefficient (r) of -0.95 indicate?

Back

A correlation coefficient of -0.95 indicates a strong negative correlation between the two variables.

Front

What does a correlation coefficient (r) of 0.9 indicate?

Back

A correlation coefficient of 0.9 indicates a strong positive correlation between the two variables.

Front

What is a lurking variable?

Back

A lurking variable is a variable that is not included in the analysis but affects the relationship between the variables being studied.

Front

If r=0, what does it imply about the correlation?

Back

If r=0, it implies that there is no correlation between the two variables.

Front

What is the range of correlation coefficients?

Back

The range of correlation coefficients is from -1 to +1.

Front

What does a positive correlation mean?

Back

A positive correlation means that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation mean?

Back

A negative correlation means that as one variable increases, the other variable tends to decrease.

Front

What is the purpose of a scatter plot?

Back

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

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation indicates that one variable directly affects the other.