Correlation - Linea

Question 1

What is the null and alternative hypothesis for correlations?

Answer 1

Null: there is no correlation between X and Y
Alternative: there is a non-null between X and Y

Question 2

What is the R value for the alternative and null hypothesis?

Answer 2

R = 0: Null - no correlation
R >< 0: Alternative

Question 3

How do you create a randomisation distribution for correlations?

Answer 3

You shuffle one of Y or X, making you break the association between the two.
You keep reshuffling them and take the correlation to create the null distribution.