Consider the following data for a dependent variable y and two independent variables, x1 and x2. The estimated regression equation for these data is y^=−18.06+2.00x1+4.71x2 Here, SST =15,090.1,SSR=13,937.2,sb1=0.2495, and sb2=0.9577 (a) Test for a significant relationship among x1,x2 and y. Use α=0.05. Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to three decimal places.) p-value = (b) Is β1 significant? Use α=0.05. Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to three decimal places.) p-value = (c) Is β2 significant? Use α=0.05. Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to three decimal places.) p-value =