Interpreting Cirrekation Coeficients

Question 1

What does pearsons product moment correlation coefficient measure

Answer 1

The correlation (linear relationship) between 2 variables

Question 2

Between what values can pearsons PMCC be

Answer 2

Between -1 and 1

Question 3

What does the value of pearsons PMCC mean

Answer 3

The value indicates the strength and direction of the correlation

Question 4

What does a pearsons PMCC of -1 mean

Answer 4

Perfect negative correlation

Question 5

What does a pearsons PMCC of -0.5 mean

Answer 5

Weak negative correlation

Question 6

What does a pearsons PMCC of 0 mean

Answer 6

No correlation

Question 7

What does a pearsons PMCC of 0.5 mean

Answer 7

Weak positive correlation

Question 8

What does a pearsons PMCC of 1 mean

Answer 8

Perfect positive correlation

Question 9

What is the difference in data used between pearsons PMCC and Spearman’s rank correlation coefficient

Answer 9

Pearsons PMCC is calculated using data values
Spearman’s rank correlation coefficient uses ranked data

Question 10

What does pearsons PMCC tell you

Answer 10

Measures how close the data points on a scatter diagram lie to a straight line (only detects linear association between variables)

Question 11

What did the SRCC tell you

Answer 11

Measures relationships between ranks (these could be strong even if the data has a non linear relationship).
Can detect linear and nonlinear association