In a study of the influence of financial institutions on bond interest rates in Germany, quarterly data over a period of 12 years were analyzed. The postulated model was y = b0 + b1x1 + b2x2 + e where y = change over the quarter in the bond interest rates x1 = change over the quarter in bond purchases by financial institutions x2 = change over the quarter in bond sales by financial institutions The estimated partial regression coefficients were as follows:

b1 = 0.057 b2 = -0.065 The corrected coefficient of determination was found to be R2 = 0.463. Test the null hypothesis:

H0 : b1 = b2 = 0