6. The dependence of the blood-pressure (Y) of 13 men on their age (X1 years) and body-weight (X2 kg) is investigated. The sample means and the empirical cocariance matrix of the three variables are as follows: Y = 130 X1 = 48 X2 = 75. 2 a 1 C = 2 2 1 3 In the two-variate regression model, estimate the model parameters and calculate the multiple correlation coefficient between Y and (X1, X2)! Further, investigate the hypothesis Ho : a1 = a2 = 0 with significance 0.1 and explain the result