Take a minute to recall what you know about correlation

(see “Research methodology”). To test your knowledge, answer these questions.

● What is the “third variable”?

● What does it mean when someone says that a correlation is “statistically signicant”?

● What is the range of values of the correlation coecient?

● What does a negative correlation mean?

● What does a zero correlation mean?

● What is the dierence between eect size and statistical signicance?

● What does this mean: r = 0.56, p < 0.05?