please give complete answer on urgent basis

Q1: Association of Two Securities in a Portfolio Consider the historical data for the following two securities in a portfolio Year Stock A Stock B Return (Ra) Return (Rb) 1 0.50 0.25 2 0.40 0.15 3 -0.07 0.32 4 0.09 -0.20 Sample Mean 0.23 0.13 Standard 0.2655 0.2308 Deviation Required: a) Measure the association of above two securities in portfolio and comment on the results with proper evidence based on mathematical results