# Tag Info

Accepted

### Is the cosine angle between two R.V. an (approximation) not equality to the correlation coefficient?

Hint: $X \cdot Y$ is a random variable. $\text{Cov}(X,Y)$ is an expected value. ---- addendum ----* There is some confusion of terminolgy in your post. If $\bf X , \bf Y$ are two random vectors (in ...
• 33.5k