when we are testing for the regression coefficients, typically our hypotheses would be h_{0}:b_{0}=0 or h_{0}:b_{1}=1.

Is b_{0} considered the risk free rate and we are trying to test that b_{0} is not equal to 0 because otherwise we get no return? And for b_{1}=1, we are hoping to reject this hypothesis and get a market beta different than 1 because otherwise the stock’s will be as sensitive as the market?