Calculate Correlation Coefficient

Calculate the Correlation Coefficient of the following table.

• r= -0.01 no correlation

• r= -0.01 weak positive

• r= -0.01 weak negative

• r= 3.71 strong positive

Estimate the correlation coefficient (or the r-value).

• r = 0.8

• r = -0.5

• r = 0.5

What is most likely the correlation coefficient for this data set?

• r = -0.20

• r = -0.70

• r = 0.83

• r = 1.00

To convince his students to slow down, Coach Logan tracks the typing speed and the number of errors made from a few of his students. Calculate the correlation coefficient, r, of the data set. Round to THREE decimal places.

Mathematical Equivalence

ON

Derrick thinks playing video games results in him doing more work. His roommate thinks otherwise. Calculate the correlation coefficient, r, of the data set. Round to THREE decimal places.

Mathematical Equivalence

ON

Order the correlation coefficients from STRONGEST linear relationship to WEAKEST

• -0.89

• 0.80

• 0.45

• -0.50

Estimate the correlation coefficient for this scatterplot.

• r = -0.9

• r = 1

• r = 0.9

• r = -1

A perfect positive correlation has a correlation coefficient of ____. 

• 1

• -1

• 0

The correlation coefficient, r is used to determine

• y values given values of x.

• x values given values of y.

• the strength and direction of relationship between x and y.

• none of these.

Coefficient of correlation lies between

• 0 and +1

• 0 and -1

• -1 and +1

• -5 and +5

Answer explanation

The value of r must be between -1 and +1