Pearson's product moment correlation coefficient (AQA GCSE Statistics): Flashcards
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What does PMCC measure in data sets?
What does PMCC measure in data sets?
It measures the strength of linear relationships.
What is the range of PMCC values?
What is the range of PMCC values?
PMCC values range from -1 to +1.
What does a PMCC of +0.9 indicate?
What does a PMCC of +0.9 indicate?
It indicates a strong positive linear correlation.
What does a PMCC close to 0 signify?
What does a PMCC close to 0 signify?
It signifies no clear linear relationship.
How does PMCC differ from Spearman's rank?
How does PMCC differ from Spearman's rank?
PMCC focuses on linear relationships only.
What does a PMCC of -0.7 suggest?
What does a PMCC of -0.7 suggest?
It suggests a strong negative linear correlation.
If data points are scattered, what PMCC value?
If data points are scattered, what PMCC value?
The PMCC value will be close to 0.
What should you check first in PMCC problems?
What should you check first in PMCC problems?
Look at the scatter plot for the relationship type.
What does a PMCC of +1 mean?
What does a PMCC of +1 mean?
It means a perfect positive linear relationship.
Why might PMCC be low with a strong relationship?
Why might PMCC be low with a strong relationship?
If the relationship is curved, not linear.