Chapter 9 Review

Front

What should a residual plot look like?

Back

A residual plot should look random, indicating no discernible pattern in the residuals.

Front

In order to graphically represent a correlation between two variables, researchers construct a ___

Back

scatterplot.

Front

A perfect negative correlation has a correlation coefficient of ____

Back

-1.

Front

The correlation coefficient is always between ___ and ___

Back

-1 and 1.

Front

Determine the correlation coefficient of the given data: - .8477, .1770, .8956, - .9463

Back

- .9463.

Front

What does a correlation coefficient of 0 indicate?

Back

A correlation coefficient of 0 indicates no correlation between the two variables.

Front

What is the purpose of a scatterplot?

Back

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

Front

What does a correlation coefficient of 1 indicate?

Back

A correlation coefficient of 1 indicates a perfect positive correlation between the two variables.

Front

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

Back

The range of possible values for a correlation coefficient is from -1 to 1.

Front

What does a negative correlation coefficient indicate?

Back

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