Correlation Practice

Which graph represents data that has a correlation coefficient close to -1?

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

• r = -0.20

• r = -0.70

• r = 0.83

• r = 1.00

Order the correlation coefficients from STRONGEST linear relationship to WEAKEST

• -0.89

• 0.80

• 0.45

• -0.50

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

What's true about r and r²?

r² measures ​ ​ (a)  

r measures ​ (b)  

• how well a function fits the data

• linearity

Tags

R vs R^2

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

Match each description with the best possible correlation.

• Positive Correlation

• Total time spent playing video games and the number of cars you own

• No Correlation

• The number of days absent from school and your final grade in a class

• Negative Correlation

• The temperature outside and ice cream sales

What type of correlation does the graph show?

• Positive Correlation

• Negative Correlation

• No Correlation

What type of correlation does this graph have?

• Positive correlation

• Negative correlation

• No correlation

• Constant correlation

What type of association does this graph have?

• positive

• negative

• none

• all of the above