Correlation and Data Representation

Front

What does a correlation coefficient of r = -0.9 indicate?

Back

It indicates a strong and negative correlation between the two variables.

Front

What is the correlation coefficient of the data set: (1,-3) (2,-6) (3,-9) (4,-12)?

Back

The correlation coefficient is -1.

Front

How do you calculate the residual for a given data point?

Back

Residual = Actual value - Predicted value.

Front

If a person works 35 hours and makes $902, what is the residual?

Back

The residual is $43.55.

Front

What is the predicted income for 22 hours worked on an assembly job?

Back

The predicted income is $449.60.

Front

True or False: The response variable is always the same as the dependent variable.

Back

True.

Front

What does a correlation coefficient of r = 0 indicate?

Back

It indicates no correlation between the two variables.

Front

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

Back

The range is from -1 to 1.

Front

What does a positive correlation coefficient signify?

Back

It signifies that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation coefficient signify?

Back

It signifies that as one variable increases, the other variable tends to decrease.