Compute the correlation coefficient

How do the monthly returns of ABC and the one of its benchmark move together?

To answer this question, you should compute the correlation coefficient of the two series of historical returns. Such a coefficient is also called "Pearson correlation coefficient", named after the English mathematician Karl Pearson.

Use both the functions CORREL() and PEARSON() to compute the correlation coefficient. They require two arguments, the series of historical returns for stock ABC and the series of historical returns for the benchmark.