Recall & Review
beginner
What is correlation analysis in simple terms?
Correlation analysis measures how two things move together. If one goes up and the other goes up too, they have a positive correlation. If one goes up and the other goes down, they have a negative correlation.
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beginner
What does a correlation coefficient of 0 mean?
A correlation coefficient of 0 means there is no linear relationship between the two variables. They do not move together in any predictable linear way.
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intermediate
Name two common methods to calculate correlation.
Two common methods are Pearson correlation (measures linear relationship) and Spearman correlation (measures monotonic relationship, good for ranked data).
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beginner
Why is correlation not the same as causation?
Correlation shows that two things move together, but it does not prove one causes the other. There could be other reasons or just coincidence.
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beginner
What is the range of values for the Pearson correlation coefficient?
The Pearson correlation coefficient ranges from -1 to 1. -1 means perfect negative correlation, 1 means perfect positive correlation, and 0 means no linear correlation.
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What does a correlation coefficient of -0.8 indicate?
Which correlation method is best for ranked data?
If two variables have a correlation coefficient of 0, what does it mean?
Which of these statements is true about correlation?
What is the maximum value of the Pearson correlation coefficient?
Explain in your own words what correlation analysis is and why it is useful.
Describe the difference between correlation and causation with an example.