5. The linear regression in problem 1 is estimated using 26 observations on R and W. The least-squares estimate of b is 40.495, and the standard error of the estimate is 16.250. Perform a f-test for statistical significance at the 5 percent level of significance. a. There are degrees of freedom for the f-test. b. The value of the f-statistic is The critical t-value for the test is